How to Choose a Bike Helmet
Galbraith Bike Park
Fox MainFrame Mips Bike Helmet
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This Fox trail helmet features the Mips® impact protection system and extended coverage for added safety. It also has optimized venting and channels for efficient cooling.
Shop similar products- Proven Mips® impact protection system reduces rotational forces in a crash by absorbing and redirecting energies and forces otherwise transmitted to the brain
- Extended coverage for added safety
- Optimized venting with channeled, in-molded EPS provides efficient cooling
- Removable, washable moisture wicking liner
- Mips® integrated fit system reduces weight and provides a more comfortable, seamless fit
Imported.
To find your size, position a tape measure just above your ears and about 1 in. above your eyebrows. Keep the tape level to measure the circumference around the largest part of your head and then find the corresponding size in the Technical specs info.
View all Fox Mountain Bike Helmets| Best Use | Mountain Biking |
|---|---|
| Helmet Style | Mountain Bike |
| Helmet Construction | In-mold |
| Shell Material | 42% expanded polystyrene/15% polycarbonate/14% polyamide/11% polypropylene/4% polyester |
| Vents | 17 |
| Visor/Brim | Yes |
| Gender | Unisex |
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Customer Images
Most Helpful Favorable Review
7 people found this review helpful
10 months ago
Solide performance and value
Well made and comfortable and very affordable. It provides the protection of MIPS. What’s not to like.
Spoke and Wheel
TXMost Helpful Critical Review
19 people found this review helpful
1 year ago
Purchased on 9/2025 and helmet was made on 12/2021
Unable to rate helmet, as REI sent a 3.5 yo product.
One star is for REI selling old helmets.
No, I do not recommend this product
JBC
Location:Texas
Age:75 or over
10 months ago
Solide performance and value
Well made and comfortable and very affordable. It provides the protection of MIPS. What’s not to like.
Age:75 or over
Location:San Luis Obispo, CA
Age:65–74
6 months ago
Very comfortable.
Yes , I recommend this product
Very comfortable. Sized correctly as a large.
Age:65–74
Location:Salem, Oregon
1 month ago
Helmet is 4 years old!
No, I do not recommend this product
Helmet fits great but was manufactured in 2022. It was four years old when delivered. Unfortunately it would only be safe to use for three more years.
1 year ago
Purchased on 9/2025 and helmet was made on 12/2021
No, I do not recommend this product
Unable to rate helmet, as REI sent a 3.5 yo product. One star is for REI selling old helmets.
Location:Utah
Age:Under 18
2 months ago
Faulty product
No, I do not recommend this product
Visor did not detach on impact when my kid crashed his bike causing his head to impact the ground because the helmet rotated backwards.
Age:Under 18
Location:Asheville, NC
1 month ago
Selling old helmets, near expiration
No, I do not recommend this product
Should have believed the other review and the price was too good. New Old Srock that REI should know better than sale. This helmet was just a few months away from the 5year expiration date. Almost 5 years of baking in a warehouse somewhere! Very unsafe and unreliable product. REI Outlet can do better
Location:Sisters, OR
Age:65–74
2 weeks ago
Comfortable and lightweight
Yes , I recommend this product
This helmet is comfortable, well-ventilated and lightweight. The color is good because it lets my friends find me when I lag behind.
Age:65–74
9 months ago
Location:Il
Age:35–44
1 month ago
Runs big
No, I do not recommend this product
Size seems to run big and it’s not super comfortable but it was a super cheap for a mips helmet.
Age:35–44
Age:65–74
1 month ago
Fix helmet
Yes , I recommend this product
Great helmet. Maybe just a bit too roomy
Age:65–74
1 - 10 of 13 Reviews
