Mainline Mips Full-Face Helmet
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Why We Like The Mainline Mips Full-Face Helmet
Smith makes their debut into the world of ultra-light full-face helmets with the all-new Mainline MIPS. Featuring extensive ventilation and lightweight yet tough construction, this helmet offers the airy feel of a half-shell while providing downhill-certified coverage for a boost of confidence on rowdy trails. Advanced protective features include Smith's unique Koroyd crumple zones that go above and beyond to disperse impact forces, as well as a MIPS protective layer that helps mitigate harmful oblique impacts.
Details
- Smith's lightweight full-face for enduro and downhill
- ASTM certified for downhill mountain bike racing
- 21 vents keep you cool during summer shred sessions
- Koroyd layer provides superior impact absorption
- MIPS protects against oblique and rotational impacts
- Comes with multiple pad sizes to ensure a proper fit
- D-ring fastener is lightweight and super secure
- Anti-odor pads are removable and washable
- Item runs small, so we recommend sizing up for best fit
- Item #SMIZ99F
- Shell Material
- Aerocore in-mold polycarbonate
- Audio Compatible
- no
- Ventilation
- AirEvac system (21 vents)
- Fit Adjustment
- 3 different sizes of cheek pads, 2 different sizes of crown liners, 2 different sizes of neck rolls
- Visor
- adjustable
- Certifications
- ASTM F1952-15, Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older
- Claimed Weight
- [large] 1lb 15.6oz
- Activity
- downhill, enduro
- Manufacturer Warranty
- [sunglasses, goggles] limited lifetime, [helmets] limited 3 years, [apparel, accessories] limited 1 year
Reviews
Q&A
What do you think about this product?
Overall Rating
4.5 based on 332 ratings
Review Summary
Fits Slightly Small
Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.Customer Images
Here's what customers have to say
The helmet is generally well-received, with many praising its comfortable fit, lightweight construction, and excellent ventilation. Reviewers appreciate the adjustable padding and customizable fit, as well as the seamless integration with compatible goggles. The helmet is also praised for its high-quality build and protective capabilities, with some reporting it saved them from serious injury. However, there are some common complaints about annoying squeaking or creaking noises from the adjustment system, as well as difficulties with the chin strap, especially when wearing gloves. Some also note the sizing runs a bit small. Overall, the helmet is considered a high-performance option, but the noise and fit issues prevent it from being perfect.
AI-generated from the text of customer reviews.
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Selecting an option will reload the available reviews on the pageAugust 10, 2025
Great Helmet
This helmet is so lightweight, comfortable and stylish. Definitely recommend. Great protection is the most important factor and Smith technology delivers. Get one.
Originally reviewed on smithoptics.com
July 8, 2025
All around great full face
Light and ventilated enough to keep me feeling cool, sturdy enough to keep me alive after "i wanna try something cool"
Originally reviewed on smithoptics.com
May 30, 2025
Just the Full-Face I needed
- Familiarity:
- I've used it several times
Realized that a full-face helmet was a logical step for the terrain I was riding. Debated most of the major brands. Already own two Smith helmets that I love. Fit is true to size (I am a M), ventilation is about as good as is possible (still take it off for fire road climbs). Works well with my glasses and I can still thread the hydration hose into the chin guard. Very happy, but haven't crashed yet- so 4 stars.
Originally reviewed on Competitivecyclist.com
March 6, 2025
Nice fit, comfortable, good air flow
- Familiarity:
- I've used it several times
- Size Bought:
- Medium
Nice fit, comfortable, good air flow, no distractions. Fun color pop. Size medium.
February 17, 2025
Med. Helmet; hat size 7-1/4
- Familiarity:
- I've used it several times
- Size Bought:
- M
I wear 7-1/4 fitted hat, 7-1/8 when I had shorter hair. The size M fits comfortably snug with the medium size pads that come installed. (I didn't bother trying the small or large pads because it's spot on.)
October 11, 2024
MIPS squeaks, bugs get caught in ears
Nice build quality but the squeaky MIPS drives me nuts. Also there is no foam in front of your ears so you constantly get bugs trapped in there, not create if its a bee or wasp. Also this means cold ears/ice cream headache when its cold. Simple fix is to add some foam in there
Originally reviewed on smithoptics.com
August 18, 2024
10/10
Crashed at a bike park and I'm convinced this helmet is the only reason my skull isn't cracked open. So thankful I was wearing this helmet. I've heard people say it's squeaky and it is if I purposely listen for it but I don't notice it at all while I'm riding.
Originally reviewed on smithoptics.com
August 8, 2024
Good helmet
I got this helmet a season ago and it’s still great. Very comfortable and cool colors. It’s nice that you can take out some of the padding for the uphills.
Originally reviewed on smithoptics.com
July 16, 2024
They work!
I took the worst crash of my career last week and the mainline worked flawlessly.
Originally reviewed on smithoptics.com
May 30, 2024
Helmet works!
I like my mainline helmet. I cased a jump and landed on my head. I hurt in many places but not my head. Did its job well.
Originally reviewed on smithoptics.com
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