Best Sports Bras for AA to D Cups of 2026
Supportive and Comfortable Sports Bras for Running, Hiking and Outdoor Pursuits
April 16th, 2026, updated with a new overall winner, new best sports bras for running, to remove discontinued products
Home > Gear Reviews > Apparel
A good sports bra should feel like nothing is there. No bouncing, no chafing, no straps digging in after two hours of movement, and no mid-run readjustment. That sounds simple enough, but finding a bra that actually delivers all of that across a range of activities and cup sizes is genuinely harder than it should be.
I'm an avid skier, mountain biker, trail runner, backpacker, and yoga practitioner, and I'm always on the hunt for sports bras that keep up. For this guide, I researched nearly 50 models, narrowed the field, and tested 25 sports bras with both a size A/B cup and C/D cup tester across hikes, trail runs, yoga sessions, gym workouts, cross-country skiing, backcountry skiing, and even sleeping, to see which ones earned a permanent spot in the rotation. This guide covers AA to D cups; for larger cup sizes, see our companion guide to the Best Sports Bras for D+ Cups.
We evaluated each bra on support level for the intended impact, moisture wicking and breathability, comfort over extended wear, how well the sizing actually matched the sizing chart, odor resistance for multi-day use, and whether the bra was something we actually wanted to reach for again.
Top Pick: The Ridge Merino Send It Seamless Sports Bra earns our Best Overall award. It stood out for its rare combination of merino wool odor resistance and quick-dry performance with enough recycled nylon and spandex compression to handle everything from mountain biking and hiking to a 75-mile gravel race in the heat, all in a simple racerback design that fits true to size and genuinely disappears during wear.
We create reader-supported, objective gear reviews independently selected by our editors. This story may contain affiliate links, which help fund our website. When you click on the links to purchase gear, we may get a commission — without costing you an extra cent. Thank you for supporting our work and mission of outdoor coverage for every body! Learn more.
Comparison Table for Sports Bras
| SPORTS BRA | TREELINE AWARD | SIZES | SUPPORT / IMPACT | STYLE | COMPRESSION OR ENCAPSULATION? | MATERIAL |
|---|---|---|---|---|---|---|
| Smartwool Intraknit Racerback | Best overall Read review |
XS-XL | medium | racerback | compression | nylon, merino wool, elastane |
| Oiselle Flyout | Best sports bra for running Read review |
XS-L | medium | racerback | compression | compressive nylon, elastane |
| Prana Becksa Bralette | Best low impact Read review |
XS - XL | low/medium | crop racerback | compression | recycled poly blend |
| Ortovox 185 Rockin' Wool Sport Top | Best wool Read review |
XS - XL | low | racerback | compression | merino wool with elastic band |
| Girlfriend Paloma Racerback | Most stylish Read review |
XXS - 6X | medium | racerback | compression | recycled plastic, Spandex |
| Tracksmith Allston | Best lightweight Read review |
XS - L | medium | racerback | compression | compressive nylon/ elastane |
* Prices reflect MSRP and are subject to change. We note any discounts we see on our Deals page, which is updated daily.
The Best Sports Bras for A-D Cups
After researching over one hundred sports bras on the market, we tested 25 different styles to find the best sports bra for everything from yoga to running and even backcountry adventures.
Best overall Sports Bra:
Smartwool Intraknit Racerback
Bra size availability: 2-14
Support/Impact: medium/high
Style: wide-strap racerback
Encapsulation or compression: compression
Material: nylon, merino wool, polyester, elastane, lyocell
Features: removable pads
Thanks to the excellent compression and support, the Smartwool Intraknit wins our best overall sports bras. We’ve used and tested iterations of this bra for nearly a decade on hikes and backpacking trips, bike rides, and more.
It’s wonderfully comfortable and surprisingly durable, given its merino composition. If you’re looking for a comfortable, low to medium impact bra with merino wool to help with odor resistance, this is a great choice.
Smartwool Intraknit Racerback
-
Merino wool is an excellent material for next-to-skin layers in all seasons—it wicks moisture, dries quickly, and resists odor. But pure merino wool on its own does not have much structure or compression.
So this bra, while it does have a significant amount (41%) of merino woven into it, it also uses sturdier and more compressive materials like recycled nylon and spandex. This makes for a sports bra that performs well on all fronts, from support and compression to sweat wicking and odor control.
-
In our testing, we often found the most comfortable sports bras to be the ones with designs that weren’t overcomplicated. This basic racerback design has straps that are wide enough to be supportive without being cumbersome, and they hit in just the right spot, meaning they don’t cause any pressure or pain in the shoulders or neck.
I like the seamless design of the Smartwool Intraknit bra, which means you basically forget about it under your backpack straps.
-
For backpacking specifically, when I’m wearing a heavier pack and the same bra for days on end, I like something simple, extremely comfortable, odor resistant, and reasonably supportive.
The Smartwool Racerback hits all those marks on the nose. The wool blend fabric means I can wear it for an entire trip and not worry about smell, but the added nylon and polyester give the bra a little more support.
Best sports bra for running: Oiselle Flyout
Bra size availability: 2-14
Support/Impact: medium/high
Style: wide-strap racerback
Encapsulation or compression: compression
Material: polyester and spandex
Features: wide straps for comfort and support, back phone pocket
What we liked: wide straps are comfortable and supportive, good compression and support without being overly cumbersome to wear
What we didn’t like: thick fabric is slower to dry
For high impact activities like running, a supportive bra is critical. After testing numerous high-impact sports bras, we’ve found the Oiselle Flyout bra to offer the ideal balance of support and comfort for high impact activities for A-D cup sizes. (If you’re a larger cup size, you can find more options in our sports bra review for D+ and up sizes.) The combination of compressive fabric, ample coverage, and uniquely wide shoulder straps make this our favorite running and high impact bra.
Oiselle Flyout
-
The Oiselle Flyout Bra is most similar to a racerback, but the unique design places it in a category of its own. Instead of thinner straps and big cut-outs in the shoulders in the back, this sports bra has extra wide shoulder straps and more coverage in both the front and back, compared to other bras we tested.
This means that the bra has good, even support and does not have any pressure point areas. Though Oiselle’s website lists the bra as “medium impact,” we think it offers more support that all of the other medium impact bras we tested, and therefore think it is more of a high impact bra (even for our C/D cup tester). We found the compression and support is ample for high-impact activities for A-D cups.
-
The Flyout bra is made with a blend of polyester and spandex, and the fabric is fairly thick, which helps with support and compression. We like the thick fabric on this bra for high impact activities, but it is admittedly a little cumbersome and less breathable than lighter weight bras we tested. Still, we love the support this bra gives while remaining comfortable. We found this bra to fit true to size. Our tester who wears a medium in most sports bras found a good fit with a 6 in the Flyout.
-
Along with the excellent strap design, this bra also features one large pocket at the back that fits most phones. This came in clutch on runs when we didn’t want to wear a vest, but still wanted to carry a phone for music or navigation. We prefer bra pockets in the back, but this can be a personal preference. There was some minor sweat accumulation on the phone after using the pocket for runs lasting a couple hours, but nothing unexpected or problematic.
-
Our tester uses this bra religiously for running. She uses it for regular runs in all seasons, and has used it for training and races, like the Moab Half Marathon. Many high-impact bras can end up feeling like body armor—not something everyone wants when out on a run. But a supportive bra is crucial for runners (and can even help prevent injuries, according to this study). So we love that the Flyout gives the support we need without being too bulky or overly structured.
Best Low Impact Longline Bra:
Prana Becksa Bralette
Bra size availability: XS-XL
Support/Impact: low/medium
Style: crop racerback
Encapsulation or compression: compression
Material: recycled poly blend
Features: interior shelf bra, removable cups, UPF 50+
What we liked: coverage, comfort, style, versatility
What we didn’t like: a true low impact bra, this isn't going to work for higher impact activities
Good coverage, light compression, and maximum comfort: These are the critical qualities of an excellent low-impact crop bra, and the prAna Becksa Bralette delivers on all this and more. The prAna Becksa bralette is our favorite sports bra for yoga and other low-impact workouts for its coverage, comfort, and style—and wins our award for best low impact sports bra.
The Becksa Bralette is a racerback style longline crop bra with ample coverage, so it’s versatile enough to be worn underneath a shirt or on its own with leggings or other athletic wear. It has a soft, ribbed polyester blend fabric that offers light compression and an ultra-comfortable feel while maintaining technical features like breathability and sweat-wicking. This bra became our go-to for low-impact activities throughout testing, and it’s now a staple for our tester’s morning yoga practice.
Prana Becksa Bralette
-
People on the smaller cup spectrum have long loved prAna bras. Unlike other prAna bras we’ve tested, this one offered enough support, coverage, and comfort for our D cup tester.
The Becksa offers the perfect amount of coverage, and even when we found ourselves in inverted yoga poses, the bra held everything in. We could focus on the workout movements rather than adjusting clothing.
The Becksa Bralette has a scoop-neck cut in the chest and a straight crop bottom, which we found to offer the right amount of coverage. This was helpful for situations where you don't need a lot of impact, but do want coverage, such as yoga.
The bra comes with removable pads, though our tester prefers wearing it without them.
-
Beyond yoga, mellow hikes, and casual wear, this bra lacks the support of others in our test – which is what we would expect from a low impact bra. But, much like the low-impact Smartwool bra, this bra is comfortable enough to wear while sleeping.
-
Despite the extra material from the high coverage cut, the Becksa Bralette performed well with sweat management. While it doesn’t offer quite as much breathability as the Smartwool, we never found ourselves soaking the bra with sweat, even during hour-long power yoga sessions.
-
There are many brands that make a crop style bra these days. However, we found that the Becksa has better support and served cup sizes A to D better than the Conscious Crop.
-
We think the Becksa Bralette fits true to size, with our B cup tester wearing a small and our C/D cup tester wearing a medium. The Conscious Crop had sizing issues for our C/D cup tester and customer reviews reflect this.
-
If you’re looking for a comfortable, technical, and stylish bra with ample coverage and a cropped style for yoga and other low-impact activities, the Becksa is our top pick. If you're specifically shopping the brand, we also tested Title Nine's low-impact Wanna Sweat Racerback for A–B cups.
best wool sports bra: Ortovox Rockin’N’Wool Sport Top
Bra size availability: XS-XL
Support/Impact: low
Style: racerback
Encapsulation or compression: compression
Material: 100% merino with elastic band
Features: all wool, super breathable
When you’re deep in the backcountry, moisture management, and odor control matter more than just about any other feature when it comes to your next-to-skin layers.
After dozens of days of extended, high-output activities in the backcountry, we’ve fallen in love with the Ortovox Rock’n’Wool Sport Top for low-impact multi-day activities in the wilderness.
Along with its superior moisture-wicking and odor management, this bra stood out as the most comfortable in our test. It’s easy to forget you’re even wearing a bra, so much so that we even found it to be comfortable enough for sleeping. This combo of features makes the Rock’N’Wool ideal for multi-day backcountry adventures when space in your pack is limited and changing base layers doesn’t often happen, if at all.
Ortovox Rockin’N’Wool Sport Top
Ortovox Sport Top has a wide band and is the only sports bra we tested made of 100% merino wool
-
In our research phase for this story, we came across a handful of bras that had merino wool blended with synthetic fabrics and bras that had bits of merino lining; but this is the only bra we found that's made of 100% merino wool (aside from the elastic support band). For this reason, the Rock’N’Wool Sport Top stands out as the most breathable, fastest-drying, and best sweat-wicking bra in our test.
-
However, because the central part of the bra is all wool with no spandex, nylon, or poly materials blended in, it is also the lowest impact bra in our test. Still, we think this is fine for backcountry pursuits when compression and support are not top priorities, but odor control and moisture management are non-negotiable.
-
The Rock’N’Wool Sport Top is a racerback style sports bra made entirely from sustainably-sourced merino wool, with an elastic underband for light support. There is mesh-woven merino in both the front center of the bra and on the back for maximum breathability. It offers enough support for light impact activities like hiking and backcountry skiing.
-
We tested this bra for years on multi-day backcountry skiing trips, winter hiking, and cross country skiing, and no matter how hard we worked, we stayed warm and dry. That’s one of the bonus qualities of wool over synthetic fabrics: It maintains its warmth when wet and doesn’t hold moisture for long (because the outer fibers of wool are hydrophobic and repel water). We haven’t tested this bra in summer temperatures, but given what we know about wool’s temperature management, and because this bra is so breathable, we assume it will perform well in a wide range of temperatures.
-
The Rock’N’Wool Sport Top fits true to size with medium coverage and light compression. Our 34 C/D tester found the size medium to fit just right; though for larger cup sizes, the coverage is on the light side on the sides of the bra. (This was not an issue for our tester, but still, something worth noting.)
-
The main downside to this low-support bra is the price tag, though it’s standard for merino wool garments to be pricier than their synthetic counterparts. We believe this bra is worth every penny for the right user. If you’re a backpacker, backcountry skier, or generally spend a significant amount of time in the backcountry and need a bra that keeps you dry and comfortable, the Ortovox Rock’N’Wool Sport Top is the best choice for you.
Most Stylish: Girlfriend Collective Paloma Racerback Bra
Bra size availability: XXS-6XL
Support/Impact: medium
Style: racerback
Encapsulation or compression: compression
Material: recycled plastic/spandex
Features: no padding, support band, UPF 45+, recycleable through company
What we like: comfort, size options, color options, sun protection, made of recycled material, company take-back program, surprisingly good compression for a light bra
What we didn’t like: could be better at sweat wicking or breathability
The minimalist, stylish, comfortable Paloma Racerback Bra from Girlfriend Collective is a piece we reach for often for everyday wear. With Girlfriend’s impressive range of sizing, this bra earns a top spot for everyday use. We love the minimalist design and simple, modern style of the Paloma Racerback for just about any low- or medium-impact activities, from running errands to morning yoga and an afternoon gym session.
We also like the sustainability on the Girlfriend Collective sports bra. The synthetic fabric on the Girlfriend Collective Paloma sports bra is made from recycled plastic bottles and woven with spandex for added support and
Girlfriend Collective Paloma Racerback Bra
The Girlfriend Collective Paloma Sports Bra is our best everyday bra due to its comfort, ample coverage, and size availability.
-
We tested this bra on winter hikes, indoor gym workouts, and while doing yoga and found it to blur the line between light and medium compression. It was enough for relatively high-impact strength workouts in the gym, though not quite enough for a trail run, and comfortable enough to wear while lounging around the house or running errands.
-
The Paloma Racerback offers ample coverage, and we didn’t have issues whether we were doing jump squats or upside down in a yoga headstand.
-
When it comes to sweat-wicking, this bra is average. The double-layered material and thick underband make this bra comfortable without feeling cumbersome. But, for the same reasons, it doesn’t breathe as well as others in our test. Still, for more coverage during mellower activities, we love this bra.
-
Another reason we love this bra is its wide range of sizes. The Paloma Racerback comes in sizes XXS-6XL. It runs true to size, and our 34C/D tester found the medium to be a perfect fit. The Paloma also has aesthetic, modern colorways that we love.
-
The Paloma Racerback is one of Girlfriend Collective’s most popular bras, with over 1,300 positive customer reviews. And while other reviews we researched didn’t mention this specific bra, Girlfriend Collective received shoutouts from other media outlets.
For a stylish, comfortable bra in a wide range of sizes to wear any day of the week, we love the Paloma Racerback.
Best lightweight sports bra: Tracksmith Allston
Sizing: XS-L
Support: medium
Style: racerback
Encapsulation or Compression: Compression
Material: compressive nylon/ elastane
Features: internal phone pocket, lined
What we liked: comfort, excellent breathability, front pocket fits phone or other small items
What we didn’t like: price, pocket takes some getting use to
For those looking for a lightweight bra with enough support for long runs, the Tracksmith Allston is the best lightweight sports bra we tested. This sports bra landed in the ranks as one of the most comfortable in our test, thanks to the lightweight fabric and simple, classic racerback fit. For that reason, it’s one of our favorite gear items ever and has made its way into our Best Gifts for Runners list.
Tracksmith Allston
-
Tracksmith calls the Allston a medium-impact bra, and we agree with that. It works well for a running bra for folks on the smaller side of the cup-size spectrum; if you’re a D or larger, you may want to consider a bra with more support than this one.
-
This bra is made with a blend of nylon and elastane. It’s lightweight with a minimalist design, and it breathes well and wicks sweat with ease. The bra does not come with padding or molded cups, but this is part of what makes it so breathable and comfortable.
-
One feature that stands out with this bra is the spacious front pocket, which is large enough to fit a phone or other essentials. This is handy for runners who prefer to get out sans pack but still want to bring a small item or two along. It’s worth noting that though the pocket is convenient, it takes some getting used to carrying things in the front of your bra.
-
The primary downside to this bra is the price. It costs about twice as much as a comparable Nike bra. If you’re willing to splurge, we think this bra is worth it for comfort and that handy pocket. But, if you’re on a budget you can find a bra that will still get the job done well for far less.
-
Another thing several Treeline Review readers have written in to let us know about is the fit. The first time you try this on, it will feel very tight. We had our two testers (a size S and size L) confer and they had similar experiences and that it stretches to fit perfectly after a wash and a few uses. But keep this in mind before you purchase!
-
Overall, if you’re a runner who loves sleek simplicity in a sports bra and you don’t mind paying a little extra for that, consider the Allston. It also comes recommended by runners world and has been a favorite among everyday customers and other folks here at Treeline Review. If you’re going to splurge on a sports bra, splurge on this one.
Best Budget Sports Bra: Nike Swoosh
Sizing: XS-2XL
Support: medium
Style: racerback
Encapsulation or Compression: Compression
Material: recycled polyester/ Spandex
Features: removable 1-piece pad, pad pocket fits phone
What we liked: bang for the buck, enough support for all but the bounciest situations, functional, made of recycled material
What we didn’t like: other bras have better pockets, not as stylish
If you’re in need of a good all-around sports bra but don’t feel the need to splurge on it, the Nike Swoosh is a tried and true sports bra that has served Treeline testers well for years. This medium impact bra is simple but functional, and it offers enough support for all but the bounciest things you might find yourself doing. That’s why the Nike Swoosh wins our award for Best Budget sports bra in this guide, and also our guide to the Best Sports Bras for D+ Cup.
Nike Swoosh
-
When we say the design of this bra is simple, that doesn’t mean it’s lacking. It has a single removable pad that adds shape, and the one-piece design makes it easier to keep track of and take in and out. The same front pocket that holds this padding is also large enough to fit a phone.
-
We prefer bra pockets on the back rather than the front, but this is still nice to have in a budget-oriented bra.
-
For many years, our tester and author of this story used this bra religiously. It was put through the wringer on countless trail runs, hikes, bike rides, and more. It’s easy to grab this bra out of the closet for both its simplicity and functionality. The medium support compression style bra works well for most things.
-
Our tester sized down in one of her Swoosh bras for a more compressive fit, and found it to work well even for high-impact activities. She even trusted this bra for support on her first mountain marathon and it got the job done without issue.
-
There are other sports bras out there that offer more—whether that’s features (like good pockets), style, and different fabrics (like merino wool). But for the price, we think the Swoosh can’t be beat.
-
This bra has hundreds of 5-star customer reviews across multiple sites (in part because Nike is such a well-known company). We know why: This is a great bra for the money. If you want a good, all-around, medium support sports bra without the steep price tag, this is it.
Other sports bras we tested
Brooks 3-Pocket Run
Bra size and cup size availability: 30AB-40DDE
Support/Impact: medium impact
Style: high neck racerback
Encapsulation or compression: compression
Material: polyester/spandex
Features: Removable cups, cell phone pocket, ribcage pocket for keys/ID
Clever designs are great–if they work. The Brooks 3-Pocket Run Bra not only worked well as a high-impact sports bra, but the pockets held keys, phones, and even credit cards without extra bulk or chafing. We appreciated the high-cut coverage design when running and jumping to prevent spillage without the bra feeling constrictive. The Drive 3-Pocket has enough compression the chest compact without restricting deep breaths.
It’s our former winner for best high impact sports bra. This workout bra outperformed most in our test for the highest support for running and other high-impact activities. If you’re looking for a high support bra for running and gym workouts and every high-impact activity in between, the Brooks 3 Pocket is our top choice.
Brooks Drive 3 Pocket Run Sports Bra
Brooks is a running company that was one of the original inventors of the sports bra. The Brooks Pocket Run is one of the bestselling sports bra models at REI and is Brooks’s most popular model of sports bra.
A compressive, four-way stretch fabric helps hold everything in place. This bra offers ample coverage for a structured and supportive sports.
The fabric allows ample airflow, so back sweat was manageable. Overall, the material dries pretty quickly, which is what we want for a high impact / running sports bra.
We liked that the Brooks 3 Pocket Run has a wide bra size range for a high impact / running sports bra model with waistbands running from 30 to 40 and cup size from A to E. We had three testers on this bra, an A cup, a C-cup, and a D-cup. Our D-cup reports it fits loosely, but the A cup and C cup testers found it to be snug. Moral of the story: try it on first or order two sizes from a store with easy returns.
Ultimately, it is no longer winner for best high impact sports bra because the Oiselle Flyout is more comfortable. When our testers tried it on for the first time, it took some effort to get it on. During the first workout, the bra felt snug, but the fabric does give a bit; this is how a high-impact running bra like this should fit. After another wear and a wash or two, the bra fits perfectly snug. It has maintained its support and compression over many runs to plyometric exercises in the gym.
When it comes to sweat management, this running bra does incredibly well, which is great for running. It was only bested by our overall best sports bra for wicking moisture (that goes to the Ortovox, which is a low-impact sports bra). It’s also among the fastest drying bras we tested.
This bra is also a winner in our Best Sports Bras for D+ cups. The difference is that for people with D cups and up, it’s better suited as a medium impact bra. Most people with AA-C cups find the design and high cut work well together as a high impact sports bras. After all, this bra is specifically designed for running. Still, if you are concerned, check out our high impact and running winners in our Best Sports Bras for D+ cups.
Bra size availability: XS-XL
Support/Impact: low
Style: racerback
Encapsulation or compression: compression
Material: poly blend/wool lining
Features: removable cups, wool lining
The Kari Traa Froya bra is another go-to choice for our testers when in need of an all-around low and medium impact bra. We love the merino wool lining inside the bra for its sweat-wicking capabilities and the bra’s overall comfortable compression.
The one downside to this bra is the sizing. Our C/D cup tester originally ordered a small, per the website’s size chart, but could barely get it on. She exchanged for a medium which fit much better, though a large might have been more comfortable.
Ultimately, the Athleta Ultimate bra gets our top pick award for overall medium impact in part for accurate sizing and comfortable fit and in part for a heap of positive customer reviews. Nonetheless, we still love the Froya bra; just be sure to size up if you get one.
Kari Traa Froya
Bra size availability: 28-40 / B-J
Support/Impact: high
Style: back clasp underwire
Encapsulation or compression: encapsulation
Material: poly blend
Features: underwire, clasp back, racerback conversion, molded cups, adjustable straps
Most of us who use sports bras at Treeline prefer them without an underwire, but we understand that some do want that extra support and shape. We tested the Panache Wired Ultimate High Impact Sports Bra since it has many positive customer reviews. When we put it up against the Lululemon Enlite Weave, however, the Lululemon was more comfortable, more supportive, and had far, far better style. For a high-impact bra with shape and lift, we highly recommend the Enlite Weave. But, if underwire is a must, the Panache Wired Sports Bra is a good option.
Panache Wired Ultimate High Impact Sports Bra
Bra size availability: 32D - 40D
Support/Impact: high
Style: racerback with clasp
Encapsulation or compression: both
Material: nylon elastane
Features: adjustable straps, molded cups, hook and clasp closure
The Lululemon High Support Energy Bra was another great high-impact bra that held you in, provided separation, and didn’t give you the uni-boob look. The strappy back looks good but wasn’t the most comfortable design compared to other bras that we tested. The adjustability of those straps, however, made for a great high-impact bra choice that didn’t look like your grandmother’s bra. Still, we liked the Lululemon Enlite Weave better as a workout bra due to the sweat-wicking fabric and wide straps.
Lululemon High-Support Energy Bra B-DD
The Ortovox Rock ‘n’ Wool Sports bra is made of wool and designed for multi-day activities. Most people find that no one sports bra will work for all activities, so choose the sports bra based on what you intend to do in it and features you need.
The Girlfriend Collective Paloma sports bra is made of recycled bottles and is designed for everyday and low and medium impact use. We recommend choosing a sports bra based on the activities you are going to do while wearing it.
What to Look for in a Sports Bra
Sports bras are not like your average t-shirt bra from the department store. Finding a bra that offers the right balance of features, like support and moisture-wicking, can often be more of a challenge than finding a good regular bra to wear to the office or on a date night. We demand much more from our sports bras than our everyday ones, so it’s important to know what design features, fabrics, and styles to look for.
Design and Style
First off, it is helpful to understand the different types of sports bras that exist on the market. There are two primary categories to be aware of: encapsulation and compression. Often, there will be bras that offer features from both of these categories, though others will fall squarely in one category or the other.
Encapsulation vs. Compression
Encapsulation often refers to a more structured style of sports bra. With this style, separate cups hold and shape each side separately. A compression bra focuses on a snug fit, often without shaped cups, to hold everything in. Some bras offer a mixture of the two designs.
The advantages to encapsulation bra designs include a more shaped look, while compression styles often relieve more bounce during activities. It helps to know your priorities when selecting a sports bra. If you’re looking for a bra to wear for mellow, low-impact activities like walks and easy gym sessions and want a bra that will offer shape and lift, an encapsulation bra style will be best. If minimizing bounce is a must (such as for medium or high impact activity), compression bras will be better. However, compression bras will likely not offer as much lift and shape as an encapsulation bra. However, several bras on the market offer the best of both worlds. We tested all ends of the spectrum for this review.
There are many different strap designs, including the classic racerback style, scoop back bras with back clasps, and many variations in between. Some sports bras come with adjustable straps whereas some are fixed. Deciding on design features like this often comes down to intended use and personal preference.
Impact Level
Impact level is another crucial factor to consider when looking for a sports bra. Generally, impact levels are categorized as low, medium, and high. The higher the impact, the more support you’ll get for intense activities.
Fit
Fit is crucial in any bra, and this is especially true with sports bras. Some brands and certain styles use a more basic sizing range (small, medium, large, etc.), while others offer sizes with a specific band and cup measurement. No matter how the sizing works, you want the bra to fit you well. A high-impact bra should offer ample coverage and feel snug while remaining comfortable. Often, these bras feel a touch too small upon first wear, but they fit perfectly after a wash or two. Lower impact bras will offer a more relaxed fit with less support.
Material
How well a sports bra performs depends significantly on the fabric it’s made from. Some fabrics offer more shape and support, while others work hard to wick sweat. The bras we tested for this review come in a wide range of fabrics, from 100% recycled synthetic fabrics to merino wool. Synthetic fabrics typically offer more stretch and support; merino wool has excellent performance for moisture and temperature management and tends to fend off-odor well, though this material on its own doesn't offer as much support.
Depending on your activity and intensity, you’ll want different features from your sports bras, even if they are the correct size.
Understanding Your Cup Size
Explanation Of Cup Sizes (AA To D)
Sports bras come in a variety of cup sizes to cater to the diverse body shapes and bust sizes of anyone who is active. As with non-sports bras, cup sizes are denoted by letters, ranging from AA to D and beyond, although sometimes sports bras use S-M-L-XL.
Here's what you can expect for each sports bra size to help you get the right level of support and comfort.
AA cup: Sports bras designed for AA cup sizes typically have little to no substantial support since this is often not necessary with this size.
A cup: A cup sports bras offer slightly more support than those designed for the smallest cup sizes (AA), but support is overall still minimal.
B cup: B cup sports bras often have additional features to add support for athletic activities.
C cup: Sports bras for C cups often have similar features to those made for B cups, but typically offer a bit more support for higher impact activities.
D cup: D cup sports bras typically have more features, including wider straps and more robust cups, to keep bouncing and discomfort at bay.
Why Getting An Accurate Measurement Matters
Just like with regular bras, it’s crucial to get accurate measurements to ensure you’re buying a sports bra in the right size. Having the wrong size can lead to discomfort and a lack of support. Be sure to take your own measurements and then compare them carefully to the size chart for each specific bra to find the best fit.
Band size
To find your band size, use a soft tape measure to measure around your rib cage and back, just under your bust. You should do this without a bra or other clothing on; the tape measure should be snug against your skin but not tight. Take down the measurement in inches. Because band sizes come in even numbers, if your measurement is even, then that is your band size. If you measure to an odd number, round up to the nearest even number to find your band size.
Cup size
To find your cup size, you’ll measure around the fullest part of your chest in the same way you did for your band measurement. Be sure that the tape measure is not cinched too tightly here to get an accurate number. Then, subtract your band measurement from this measurement. The difference will be your band size. A difference of 0 inches denotes an AA cup, 1 is an A cup, 2 a B, 3 a C, and so on.
The Oiselle Flyout sports bra was designed for support and comfort for running.
How your cup size impacts what bra to get
Some sports bras offer cup and band sizing while others come in standard small, medium, and large. Either way, it’s good to know your cup size to ensure you’re getting the right bra. Some sports bras will state what cup sizes they’re designed for (i.e. a bra made for AA-C cups, or one specifically for D and larger). This helps to find the right size when cup and band sizing is not used. Of course, if cup and band sizing is used, then these measurements will quickly lead you to the appropriate size.
Support
Sports bras designed for smaller cup sizes often offer different levels of support than those made for larger ones. Knowing both your own cup size and the size the bra was designed for will help you to find a supportive fit.
Comfort
If you end up with a sports bra that is not suited to your cup size, then it’s likely to be uncomfortable, especially if it’s too small for your cup size. Ensure that you get good coverage from the bra with it being just snug enough to offer ample support.
Performance
Sizing your sports bra correctly will ensure the best performance. If you have good coverage, a comfortable fit, and the right amount of support, you should be able to forget about the bra and focus on your workout.
Care and maintenance tips for sports bras
We liked the mesh panel and half moon shape on the back of the Outdoor Voices Doing Things Bra. This design contributed to its breathability, but requires extra care to prevent snagging.
When it comes to caring for your sports bras, consider adopting practices that will ensure their longevity and functionality.
Handwash is preferable
As with regular bras (and many clothing items), gently hand washing your sports bras will aid in longevity and performance since they won’t be unnecessarily stretched in the washing machine.
Unfasten hooks
If your sports bra has hook closures, wash the bra with these unfastened to help prevent them from bending in the wash.
Mesh bag (if in washing machine
If using a washing machine, placing your bras in a mesh bag will help them to keep their shape and prevent them from tangling with other clothing items.
What type of detergent
Using gentle detergents without harsh chemicals and fragrances are best for sports bras and other activewear.
Hang dry or dry flat
Always check the label on your bra to determine washing and drying instructions. While many sports bras can technically go in the dryer, hang drying or laying flat to dry will always contribute to longevity. Dryers and heat are hard on clothes and ultimately causes them to wear faster.
How often to wash
It’s often not necessary to wash your sports bras after every single use. This will, however, depend on the level of soil and personal preference. If your bra is very sweaty or dirty after one use, it’s best to wash it. However, if it did not soak up much sweat, it’s better to wash less frequently to minimize wear and tear.
Folding and storage
If your sports bra does not have molded cups, you can store it folded. If it has molded cups, it’s best stored laying flat with the front facing up to avoid contorting the cups.
How to increase longevity
Rotate your sports bras to reduce wear and tear and odor.
Having rotating options for sports bras is not just nice for different activities. Rotating your bras will also help each one last longer if you wear and wash it less.
Change into a dry sports bra after intense workouts or water-related activities.
Wet sports bras are more prone to stretching and once this happens, it may be permanent.
Inspect your sports bras for signs of wear and tear.
Look for stretched and worn out sections of fabric that may no longer offer the same level of compression or support. Look at the straps to check for torn or overstretched threads, and ensure that clasps and hooks are still in place and functioning.
We tested the Smartwool Seamless Racerback (left) and the Smartwool Seamless Strappy Bra (right). The Seamless Racerback left has been used for several years, the Seamless Strappy is new to us for this season.
FAQ
-
Most sports bras need replacing every 6–12 months, depending on how often you wear and wash them. Signs it’s time for a new one include stretched-out bands, loss of compression or support, fabric thinning, or straps that no longer stay in place. If a bra no longer limits bounce or feels supportive during movement, it’s past its prime.
-
Sometimes—but it depends on the activity and your support needs. Lower-impact workouts like yoga, hiking, or strength training often work well with lighter-support bras, while running or high-impact workouts usually require more structure and compression. Many people benefit from owning at least two bras: one for low-impact and one for high-impact activities.
-
Proper fit is the most important factor. A bra that’s too tight, too loose, or poorly shaped can cause friction, especially under the band or along seams. Look for soft, flat seams, smooth fabrics, and wide bands that stay in place. If you’re prone to chafing, moisture-wicking materials and seamless designs make a noticeable difference.
-
Yes. Sports bras designed for AA–D cups typically rely more on compression and streamlined construction rather than heavy underwires or multi-panel structures. This often results in lighter, more flexible bras that work well for a wider range of activities—but still provide enough support when properly designed.
-
Yes. Many brands now offer extended band sizing while still catering to smaller cup volumes. The key is focusing on band fit first, since support primarily comes from the band—not the straps. A well-fitted band with a supportive fabric can work extremely well regardless of cup size.
-
Yes. Some sports bras are designed specifically for nursing or pumping and combine moisture-wicking fabrics with easy-access designs. These tend to work best for low- to medium-impact activities and may not offer the same level of support as traditional high-impact sports bras.
-
A sports bra should feel snug and supportive, but never restrictive. You should be able to breathe deeply and move comfortably without the band riding up or digging in. If you feel pinching, numbness, or pressure points, the fit is likely too tight—or the wrong shape for your body.
-
Absolutely. An ill-fitting or under-supportive sports bra can lead to discomfort, distraction, chafing, and even back or shoulder pain over time. The right sports bra helps you move more freely, stay comfortable longer, and focus on your activity instead of adjusting your gear.
Some of the sports bra models we tested, side-by-side.
How We Researched and Tested
We took a deep dive into sports bras by first researching nearly 50 different models. We narrowed our search by analyzing specs, reading customer reviews, and looking for positive mentions in outdoor and sports media outlets, like Outside, Backpacker, and Runner’s World. From there, we tested 25 of the top models with a size C/D tester and an A/B cup tester. After wearing these bras for hikes, runs, yoga, gym workouts, cross-country skiing, downhill skiing, backcountry skiing, lounging around the house, and even sleeping, we found the best sports bras for every style and activity. We know that sports bra fit and function have a lot to do with body type and personal preference, so we reviewed as many models as possible so that people of all shapes and sizes doing any sort of activity can find the right sports bra.
- Hikes & trail runs
- Yoga & gym workouts
- Cross-country & backcountry skiing
- Worn overnight & while sleeping
- Tested across A/B and C/D cup sizes
- Support level for intended impact
- Moisture wicking & breathability
- Comfort over extended wear
- Sizing accuracy vs. size chart
- Odor resistance for multi-day use
Author’s Expertise: Why You Can Trust Us
Stasia Stockwell is an avid outdoor adventurer who skis, bikes, runs, hikes, backpacks, and does yoga any chance she gets. Because of this, she’s always on the hunt for the perfect sports bra for any activity. She has years of apparel testing and review writing under her belt and brings all that experience to this review.
Stasia feels far more at home on a high alpine ridge than a busy city street as a true mountain dweller. She writes primarily in the outdoor and adventure travel realm, focusing on destinations content and gear reviews that are intriguing and informative for newcomers and experts alike.
Stasia has worked as a backpacking guide in southeast Alaska and written for BACKPACKER, REI Co-op Journal, The Dyrt, and others. She’s a lifelong skier, mountain biker, backpacker, and trail runner who’s passionate about lowering barriers to entry for outdoor sports. She hopes to inspire people to love and respect the wild natural world through her work.
More of her work and adventures can be found on her website.
To see all Stasia’s Treeline articles, see her author profile.
As a freelance writer and gear tester, Stasia and Treeline Review are not sponsored, an ambassador, or an employee of any companies mentioned here. This review is unbiased, and we do this to help you find the best product for the best price. Treeline Review doesn’t accept sponsored content, native advertising, or paid reviews.
