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Key Features
Durable Construction
Injection molded shell and EPS foam construction for ultimate protection
Certified Safety
Reliable DOT and ECE 22.06 certified safety and protection
Moisture Management
Moisture wicking cheek pads and liners for optimal comfort
Ventilation
Channel venting in the EPS foam and adjustable venting ports allows controlled air flow
Secure Double D-Ring Closure
The Double D-ring closure system guarantees a snug and secure fit for your safety
Drag
Even the sky won't limit your riding in the 509's new game-changing Atmosphere Helmet. Built for riders who prioritize comfort, cost-effective performance, and safety. When entering into riding on snow safety is a priority, with both DOT and ECE 22.06 certifications this helmet meets international safety standards for ultimate protection. The double D-ring chin closure and strategically placed venting ports manage moisture and enhance airflow, quick-dry cheek pads and liners do the work, while you concentrate on the ride.
Key Features
- Injection molded polycarbonate shell
- Dual density EPS foam in helmet shell with channel venting
- Six intake vents and six exhaust vents for optimal airflow
- Moisture wicking removable Liner & Cheek pads for custom fit adjustments and easy to wash → Shop Cheek Pads for Atmosphere Helmet
- Secure double D-ring closure
- Universal camera mount capable
- Replaceable polycarbonate visor
- WARNING for California residents
Specs
- Helmet Certification: DOT & ECE 22.06
- Starting Weight: 1,250 grams
- Best Head Shape: Intermediate oval fit
- Size Range: XS - XL
- Shell Breaks:
Large shell - XS, SM, MD
XL Shell - LG, XL, 2X - Included items: 509 helmet drawstring bag, breathbox, 509 Sticker
Size Guide
You're going to LOVE the fit. Try it on and experience our perfect fit. If you don't love it, send it back in new and unused condition within 30 days for an exchange or full refund*. Risk free.
Not sure about your size? Try on at your local dealer!
*Street Helmets are a tighter fit due to cheekpad compression, however, they do pack out over time/use.
How to Measure
When measuring your head, use a cloth tape. Start it just above your eyebrows and circle it around the thickest point in the rear of your head and then reference the size guide below.
Scroll to the right to see more sizes
| Size | US Hat Size | Inches | Centimeters |
| X-Small | 6 5/8 - 6 3/4 | 20 7/8 - 21 1/8 | 53 - 54 |
| Small | 6 7/8 - 7 | 21 5/8 - 21 7/8 | 55 - 56 |
| Medium | 7 1/8 - 7 1/4 | 22 1/2 - 22 5/8 | 57 - 58 |
| Large | 7 3/8 - 7 1/2 | 23 1/4 - 23 1/2 | 59 - 60 |
| X-Large | 7 5/8 - 7 3/4 | 24 - 24 1/4 | 61 - 62 |
| 2X-Large | 8 | 24 3/4 - 25 | 63 - 64 |
| 3X-Large | 8 3/4 | 25 1/4 - 25 3/4 | 64 - 65 |
| 4X-Large | 9 | 26 - 26 1/4 | 66 - 67 |
| Youth Small | 6 | 18 1/8 - 18 7/8 | 47 - 48 |
| Youth Medium | 6 1/8 - 6 1/4 | 19 1/4 - 19 5/8 | 49 - 50 |
| Youth Large | 6 3/8 - 6 1/2 | 20 - 20 1/2 | 51 - 52 |
Pressure Points
When trying on a helmet, take note of any pressure points on your forehead—a sign that the helmet is too round. Pressure points on the sides of your head indicate a helmet is too oval for the shape of your head. After you buy a new helmet, try wearing it for 30 to 45 minutes to check for pressure points before using it on a ride.
Pressure Points
When trying on a helmet, take note of any pressure points on your forehead—a sign that the helmet is too round. Pressure points on the sides of your head indicate a helmet is too oval for the shape of your head. After you buy a new helmet, try wearing it for 30 to 45 minutes to check for pressure points before using it on a ride.
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