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.
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Gloss Finish
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We have a very easy 30-day Return Policy! Please submit a Customer Support Ticket to get a Return Authorization so we can process your return or exchange.
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Reinvented to ride even harder, the second generation of the bestselling 509 Altitude series unleashes a whole new animal. Leading the charge is the 509 Altitude 2.0 Carbon Fiber Helmet with a new hand lay-up carbon composite construction that’s lighter, stronger, and straight-up sleeker than anything before it. For those who like to get aggressive, it includes the Fidlock® magnetic strap buckle for easy one-handed operation, a built-in universal camera mount, plus airflow control venting.
Key Features
- Hand lay-up carbon fiber composite construction
- XS to 4X sizes available in three shells for optimal fit and minimal weight
- Upper vents with on/off shutter closure for airflow control
- Fidlock® chinstrap strap closure for easy in and out
- Go-Pro® mounting capability, improved design
- Perfect fit between helmet eyeport and 509 goggles
- Pro-Series Breathbox for complete protection, removable for optimal air flow
- 509 helmet bag included
- California Prop 65
Specs
- Starting Weight: DOT/ECE 1150 grams
Size Guide
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. Size up for a less compressed fit.
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 |