Smith Hardline Mips Review: Burly Protection for Lift-Served Laps
A protective and feature-rich full-face MTB helmet for aggressive downhill riding
September 29, 2026
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Our verdict
The Smith Hardline Mips is a full-face helmet designed for aggressive downhill riding. We tested the Hardline over multiple seasons of mountain biking in Colorado, including many laps at bike parks like Trestle and Keystone.
This helmet is burly and protective with ample features, making it ideal for strictly downhill riding. It has a snug, secure, and comfortable fit with different pads that can be swapped out to best dial in the fit. It also features both Mips and KOROYD for rotational and direct impacts.
Because of these protective features, it is not particularly breathable and has little ventilation, so it’s not ideal for pedaling. But if you spend most of your time riding in the bike park with lift service instead of pedaling, this helmet is an excellent choice.
Smith Hardline Mips
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Smith Hardline Mips specifications
Price: $450
Weight: 990g (Medium, as tested)
Helmet type: Full-face, downhill
Safety tech: Mips, KOROYD
Construction: Composite shell
Number of vents: 16
Visor: Adjustable, breakaway
Fit system: Swappable cheek pads (2 size options included), D-ring fastener for secure fit
Sizes available: S-L
Certifications: CPSC, EN 1078, AS/NZS 2063, ASTM F1952 downhill
Comparison table
| Mountain Bike Helmet | MSRP | Type | Rotational Impact Protection | Direct Impact Protection | ASTM Downhill Certified | Visor | Venting | Sizing |
|---|---|---|---|---|---|---|---|---|
| Smith Hardline Mips | $450 | Full-face, downhill | Mips | KOROYD | Yes | Yes, adjustable | 16 fixed | S-L |
| Smith Mainline Mips | $350 | Full-face, enduro | Mips | KOROYD | Yes | Yes, adjustable | 21 fixed | S-L |
| POC Otocon Race Mips | $400 | Full-face, downhill, enduro | Mips | Yes | Yes, breakaway peak | 20 fixed | S-L | |
| Fox Rampage | $270 | Full-face, downhill | Mips | Yes | Yes, adjustable | 11 fixed | XS-2XL |
Best for
Downhill mountain biking
Bike park riding
Jumps and technical downhills
Riders prioritizing downhill protection over weight or breathability for pedaling
What we liked
Comfortable padding
Secure fit all around
Multiple forms of impact protection (Mips and KOROYD)
Adjustable, breakaway visor
Lightweight for its category
What could be better
Limited ventilation means this helmet is not great for pedaling
The fit may not suit very narrow or oval-shaped heads
How we tested
We tested the Hardline Mips over multiple seasons of riding at bike parks around Colorado, including Trestle and Keystone. We spent full days riding bell-to-bell bike park laps in this helmet, with weather changing from hot and sunny to cool and rainy throughout the day. We also took the helmet out for shorter days on small jump lines on local trails.
We rode almost entirely downhill in this helmet. While we did encounter some small climbs, we didn't really go out and pedal in this helmet, since that’s not what it’s designed for. Our primary tester spent most of the time riding downhill blue- and black-rated trails in bike parks, descending both smooth, flow trails and technical, rough downhill lines.
We tested this helmet alongside other full-face models, including the Smith Mainline and the POC Otocon.
It’s the best full face helmet in our Best MTB Helmets guide.
Performance in the field
Fit and comfort
This helmet has a snug, secure fit, exactly as a full-face helmet should. You don’t want play or movement. The option to swap out cheek pads, neck rolls, and crown liner padding in this helmet helps dial in the fit, depending on your exact head size and shape.
Because of the ample padding, we did not find any pressure points or areas of discomfort when testing this helmet. Even during full days spent at the bike park lapping trails from open to close, the Hardline remained comfortable (albeit with a few breaks on the lift to air things out).
Ventilation
There is some ventilation built into the Hardline helmet, but it is intentionally minimal in order to provide maximum protection. There are 16 small vents in the helmet shell, which offer some ventilation, but overall we did not find this helmet to be particularly airy during testing—which was not an issue at bike parks using lifts to access trails, but will be if you need to pedal.
Protection and coverage
The Hardline is a protective, downhill-specific helmet with excellent coverage and multiple forms of impact protection built into the shell. There is Mips inside the helmet for rotational impact protection. Additionally, KOROYD lines the entire helmet around the head for protection from blunt or direct impacts (KOROYD essentially crumples upon impact, helping absorb forces and ultimately lessening their impact on your head).
The use of KOROYD in a helmet like this helps reduce overall weight while still providing the direct impact protection that would normally come from using more EPS foam in the helmet's construction. And, according to KOROYD, this material absorbs more impact overall, with less rebound and elasticity than EPS foam, which may correlate to a lower risk of injury.
In addition to those impact protection measures, there is also a collarbone impact protection zone at the bottom edge of the helmet. This helps reduce impacts to the collarbone, which is a common site of injury in mountain bike crashes. Thankfully, we did not have to test these features, as no major crashes occurred during testing, but based on its construction, we trust it would do its job if one did.
Stability and retention
Thanks to the thick cheek pads, this helmet has a very snug and secure fit. When you first put it on, the helmet may feel too tight, but that’s how it’s intended to fit to prevent any play or movement when riding rough trails. We had no issues with the helmet wobbling or rattling during testing, and it always felt comfortable and secure.
Weight and feel
While this isn’t the lightest full-face helmet out there, it is on the lighter side for its category. Many other downhill-specific, full-face helmets weigh several hundred grams more. And when wearing the Hardline, we did not find it uncomfortably heavy or cumbersome.
Usability
We primarily tested the Hardline while wearing goggles, though we did occasionally use shield sunglasses. We found it most comfortable with goggles, given that the snug fit around the head can press against sunglass arms and create pressure points. When paired with Smith goggles, the helmet vents and goggle frame align to maximize airflow.
The D-ring strap used to secure the helmet is solid and works well, but can be a little finicky to thread, especially when wearing gloves. But while this is a little more tedious to secure, it is more comfortable than having a plastic buckle.
The cheek pads are easy to swap out depending on whether you need the thicker or thinner ones, and we did not encounter any fit issues with this helmet.
Durability
After loads of downhill miles, multiple camping trips, and travel days when the helmet was schlepped in a gear duffel, we have yet to encounter any durability issues with the Hardline. We think this is a well-made helmet that will last riders many seasons with proper care and barring any rough crashes.
Sustainability
Smith is working towards zero plastic waste in its packaging.
Features
Rotational impact protection system
The Hardline uses Mips for rotational impact protection. Mips (Multi-directional Impact Protection System) is widely considered the industry standard.
Mips is a thin, low-friction layer inside the helmet. In an angled impact, Mips allows the helmet to move relative to your head, helping reduce the rotational motion transferred to the brain.
KOROYD impact protection
There is full KOROYD coverage throughout the helmet shell, which helps to reduce the force of blunt or direct impacts to the head. KOROYD looks a bit like a bunch of straws glued together (to put it simply), and that honeycomb-like structure crumples on impact, absorbing much of the force that would otherwise directly hit your skull and brain. The use of KOROYD in the helmet helps keep weight low, since it’s typically lighter than using EPS foam throughout, while also absorbing a higher percentage of impact forces than EPS foam.
Collarbone impact protection zone
Smith designed specific materials at the edge of the helmet near the collarbone that help to protect against collarbone injuries, which are common in mountain bike crashes.
Adjustable visor
There is an adjustable breakaway visor on the helmet that can be set to two positions. The visor is designed to break away from the helmet in the event of a crash, helping prevent facial injuries.
Swappable cheek pads in different sizes
The Hardline comes with two different sets of cheek pads in different sizes so you can tailor the fit to your head size to maximize comfort and stability.
Ventilation channels
There are 16 small venting channels in the helmet. Overall ventilation is minimal as this helmet prioritizes coverage and protection.
Goggle compatibility
The Hardline is designed to work with goggles as the primary eye protection, and we prefer the fit with goggles. Sunglasses can be used, but they are less comfortable because the padding compresses the sunglass arms.
Should you buy the Smith Hardline Mips MTB helmet?
Buy if
You ride downhill trails with minimal climbing
You spend a lot of time riding in the bike park with lift access
You want a secure, protective, and comfortable full-face helmet
Skip if
You need ventilation for occasional climbing
You’re on a tight budget
Where to buy the Smith Hardline Mips MTB helmet
The Smith Hardline Mips MTB helmet is popular, so you have plenty of retailer options. Here are some pros for each retailer.
REI
Pros: 100% satisfaction policy for 1 year; 10% dividend for members.
Backcountry
Pros: Frequent sales for Expedition Perks members (free to join), fast shipping, Gearhead chat customer service is excellent
evo
Pros: 365-day returns, store locations in ski towns for easy last-minute pickup, may offer rentals if you want to try before you buy, earn 10% back in Rewards, free membership gets discounts on services and rentals
Advice on where to buy
In general for gear, we recommend purchasing from a place with easy or free returns, like REI.
Similar MTB helmets
Smith Hardline vs. Smith Mainline Mips
Price: $350
Weight: 770g (Medium, as tested)
Helmet type: Full-face, enduro
Impact protection: Mips, KOROYD
The Mainline is Smith’s lighter, enduro-oriented counterpart to the Hardline. It still has both Mips and KOROYD, but is lighter weight and features many more vents than the Hardline.
Enduro riders who may find themselves pedaling from time to time, and folks who want an airier and more versatile helmet and don’t mind sacrificing some protection will likely prefer the Mainline. But dedicated downhillers will find more tailored protection and features in the Hardline. For more, read my in-depth review of the Smith Mainline.
Smith Mainline Mips
Smith Hardline vs. POC Otocon Race Mips
Price: $400
Weight: 750g (Medium)
Helmet type: Full-face, enduro
Impact protection: Mips
The Otocon Race is an enduro full-face helmet that prioritizes low weight and ample airflow in a protective package. This is great for riders who want a lighter helmet that can be used in and out of the bike park and can stand a little pedaling and climbing if need be.
If you stick strictly to rough and aggressive downhill riding with little to no climbing, consider the Hardline instead. But if you need airflow and versatility, the Otocon Race is another great option.
POC Otocon Race Mips
Smith Hardline vs. Fox Rampage
Price: $270
Weight: 1130g (Medium)
Helmet type: Full-face, downhill
Impact protection: Mips
The Rampage is an affordable, protective option for a downhill-oriented full-face mountain bike helmet. It is less expensive than the Hardline but also notably heavier. The Hardline also includes KOROYD for impact protection (along with EPS foam to save weight), while the Rampage uses primarily EPS foam for direct impact protection, making the Rampage a bit heavier overall.
If you ride a lot and prioritize comfort and weight, consider spending more to get the Hardline. But if you’re looking for a solid full-face on a budget, the Rampage is a good option.
Fox Rampage
FAQ
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Yes. The Hardline Mips is ASTM F1952 downhill certified, and it also meets the CPSC, EN 1078, and AS/NZS 2063 standards. The ASTM F1952 rating matters most for bike park riding. It's a tougher standard than a regular bike helmet has to meet, and it includes a chin bar test.
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You can, but I wouldn't choose it for that. Ventilation is kept to a minimum in favor of coverage and protection, so it gets warm quickly on climbs. It's best for lift-served laps and shuttle days. If your rides mix climbing with descending, the Smith Mainline Mips is the better choice.
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The Hardline is Smith's downhill helmet, and the Mainline is its lighter, better-ventilated enduro helmet. Both use Mips and KOROYD, and both are ASTM F1952 downhill certified. The Hardline ($450, about 990 g) has more coverage and a collarbone impact protection zone. The Mainline ($350, about 770 g) has 21 vents and is much easier to pedal in.
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Smith lists the Hardline Mips at 990 grams (35 ounces) in a size medium. That isn't light, but it's on the lighter end for a downhill full-face helmet, partly because KOROYD replaces some of the EPS foam. I didn't find it heavy or tiring to wear, even on full bike park days.
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It should feel snug, almost too tight, when you first put it on. That's intentional: a full-face helmet shouldn't move or rock on rough terrain. The Hardline comes with two sets of cheek pads (25 mm installed, 30 mm in the box), two crown liners, and two neck rolls, so you can fine-tune the fit. REI lists small at 20.1–21.6 inches, medium at 21.6–23.2 inches, and large at 23.2–24.4 inches of head circumference.
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Yes, the Hardline is designed to be worn with goggles. With Smith goggles, the helmet and goggle vents line up to move air and cut down on fogging. I was most comfortable wearing it with goggles. Sunglasses work, but the snug cheek pads press on the arms and can cause pressure points.
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Yes, the Hardline has both. Mips is a low-friction plastic layer inside the helmet that lets the helmet slide slightly against your head during an angled impact, which helps reduce the rotational forces that reach your brain. KOROYD is a honeycomb of welded tubes that crumple on impact to absorb direct hits, and it weighs less than using EPS foam alone.
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If you mostly ride lift-served bike park laps, yes. You get downhill certification, Mips and KOROYD, a breakaway visor, several fit kits, and a weight that's reasonable for its category. If you're on a budget, the Fox Rampage ($270) is also downhill certified but heavier. If you pedal much at all, the Mainline makes more sense.
Why you should trust us / About the author
A true mountain dweller, Stasia feels far more at home on a high alpine ridge than on a busy city street. She’s worked as a backpacking guide in Southeast Alaska, has held a WFR, AIARE 1, AIARE 2, and avalanche rescue certifications, and is working to become an avalanche education instructor. She’s now a full-time writer and editor in the outdoor space and has been testing and writing about gear for over a decade.
Stasia learned to mountain bike as a kid in Utah, and rekindled her love for the sport after moving to Summit County, Colorado, and getting a new (and very much improved from her very old hand-me-down) full-suspension bike several years ago. She spends most of her summer days out on the singletrack. Stasia has been testing mountain bike helmets for several years and has learned what to look for in a great one. Thankfully, she has not had to do too much true impact testing—aside from the time she went OTB after just discovering she was pregnant with her first child. Whoops. (Everything was fine, and now that kid rides his own tiny bike, also often recklessly.)
You can find more of Stasia’s work on her Treeline Review author page.
