Skip to Main Content
Free Shipping
over $39.99

Orders $39.99 or more ship free within the contiguous U.S.

Free Shipping Policy
Self-Service
Returns

Doesn't fit? Don't love it?

Return any unused item within 30 days for a full refund.

Start a Return
Read our full Return Policy
Lowest Price,
Guaranteed

Found it for less?

RevZilla will match any advertised price on new merchandise available through another authorized U.S. dealer.

Submit a Price Match

Elite Service Rating

Our goal is to provide the best possible shopping experience to every enthusiast who visits RevZilla.

See what our customers are saying about us:

Customer Reviews

ZillaCash Rewards Program

Earn $5 for every qualified $100 you spend. You'll also hear about special offers and events! How it works:

1

Sign in or create an account to earn ZillaCash on your next purchase with us.

2

Earn $5 for every $100 you spend on eligible items and brands.

3

Redeem your ZillaCash Rewards on a future order with us!

See our customer service page for more details.

Open Box
GMAX Helmets

GMax AT-21S Adventure Snow Helmet Matte Black / 2XL [Blemished - Very Good]

Item: P843776
1 Read 1 Review 1 Q&A Write a Review

Item Condition: This is a new item that has light cosmetic damage which may include, but is not limited to scuffs, scratches, stains, chips or dings. … Read More

$138.71
$184.95
Save $46.24 25%
Rebate Available! View Details

Please select a Color & Size to view availability.

Product Details

Item Condition: This is a new item that has light cosmetic damage which may include, but is not limited to scuffs, scratches, stains, chips or dings. The damage affects the aesthetics but not the function of the item. The original packaging may or may not be present. There is a scuff on the rear of the shell.

GMax AT-21S Adventure Snow Helmet

The GMax AT-21S Snow Helmet is an ECE-rated helmet designed to exceed your needs on the snow while doubling as your next adventure touring lid for the road. An amber inner sun shield, speaker pockets and a moisture-wicking Coolmax CORE lining add comfort to the interior. A lightweight polycarbonate shell, dual pane anti-fog lens and included breath box keep the outside elements at bay. 

Features: 

  • Lightweight polycarbonate shell
  • Dual pane anti-fog snow lens
  • Drop down amber inner sun shield
  • Quick release buckle system
  • Removable, washable antimicrobial liner
  • Speaker pockets
  • Removable sun peak
  • DOT and ECE certified 
Product Style RevZilla Item # MFR. Product # Availability
Product Style Matte Black / 2XL RevZilla Item #1803334 MFR. Product # AvailabilityOnly 1 Left: Ships within 24 hours

GMax Helmet Sizing

For riders falling between sizes, we recommend sizing down.
Size Head (cm)
XS 54-55
SM

56-57

MD 58-59
LG 60-61
XL 62-63
2XL 64-65
3XL 66-67
4XL

68

Sizing information is provided by the manufacturer and does not guarantee a perfect fit.


How to Measure

  • H Head
    Wrap a cloth measuring tape around your head just above your eyebrows and ears. Pull the tape comfortably snug, read the length, repeat for good measure and use the largest measurement.
Product Description
Part Numbers
Sizing & Fit
1 Customer Reviews
1 4/5
1 Questions & 1 Answers

Related Video

Thumbnail for How To Size and Buy a Motorcycle Helmet

How To Size and Buy a Motorcycle Helmet

Reviews & Questions

Leave a product review for a chance to win one of our monthly $100 giveaways.
Ask or answer a question to win one of our monthly $100 giveaways.