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  • Optimized for the descent, this helmet is certified to CPSC, EN-1078 and ASTM-1952-DH, both with and without the chin bar
  • While most helmets protect only against direct impact, MIPS technology reduces rotational forces when the helmet gets hit at an angle
  • Chin bar detached easily—just push the buttons underneath, rotate up and remove; it's also just as easy to reinstall
  • When the chin bar comes off, Wind Tunnel cheek pad ventilation adds even more cooling power for your climb
  • Roc Loc® Air DH fit system includes a bumper around the dial to prevent accidental adjustments if your helmet comes in contact with your backpack or neck brace
  • Full-cut style offers an aggressive look
  • In-mold polycarbonate shell with 27 vents, EPS liner and CoolMax® polyester padding


To find your size, position a tape measure just above your ears and about 1" 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 Specs below.

View all Giro Mountain Bike Helmets

REI membership


Best Use Mountain Biking
Helmet Style Full-face
Helmet Construction In-mold
Shell Material Polycarbonate
Head Circumference
20 - 21.75 inches
21.75 - 23.25 inches
23.25 - 24.75 inches
Vents 27
Visor Yes
Weight 2 lbs. 2.4 oz.
Gender Unisex
Construction EPS foam
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Does this helmet have chin pads that can be removed to more easily remove the helmet in cases of emergency?

Asked by: anon
The complete chin bar is easily removed via a push button system.
Answered by: REIservice
Date published: 2017-05-18

Will REI carry any additional colorways of this helmet?

Asked by: Tubz
​As of April 2017, we do not plan to stock any other colors. All available colors are on our website.
Answered by: REIservice
Date published: 2017-04-21

Is there a reason this helmet is no longer available? I was looking at it just a few days ago. Now that I'm ready to purchase it, I'm not allowed to? What's going on?

Asked by: Tony
​Please contact us directly at (800) 426-4840 to inquire about ordering this item.
Answered by: REIservice
Date published: 2017-05-26

Can you strap headlamps around this helmet for nightriding? Example the petzl attik?

Asked by: Bob_Loblaw
​It is possible to mount a headlamp to this helmet with the visor in the upper position. Bike headlights with a helmet compatible mount might be a better option.
Answered by: REIservice
Date published: 2017-05-24
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