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.
We offer Free Shipping on all orders over $99 within the US. During select promotions & holidays we will offer Free Shipping on all orders within the US.
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.
We stand behind our products – the 509 industry leading warranty covers every product we make in a variety of ways.
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If you’re looking for the lightest, strongest, most comfortable helmet in dirt, look no further than the 509 Altitude Carbon Fiber Offroad Helmet. Superlight with an industry-leading 100% carbon fiber construction, it’s near-legendary for its superior mix of precisely fitting comfort, sleek profiling, and highly efficient venting. Includes the Fidlock® magnetic strap buckle for easy one-handed operation, a built-in universal camera mount, plus a protective bag for safe storage.
Key Features
- Helmet bag included with all Altitude Carbon Fiber Helmets
- Comes standard with universal camera mount
- Comes standard with Fidlock® easy-open magnetic strap clasp
- Innovative aerodynamic channels & 8 intake/exhaust vents
- 8 sizes across 3 outer shell molds ensure excellent fit
- Meets and exceeds DOT & ECE 2205 safety certification standards
- Revolutionary neck brace ready shell profile
- Dual density, interlocking eps
- Removable, washable premium liner
- Adult shell starts at 1280 grams
- Special designed expanded polyurethane chin insert
- Class leading eye port opening dimensions, which provide optimum peripheral vision
- Perfect 509 goggle fit
- One-piece eye port trim
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Size Guide
Scroll to the right to see more sizes
Not sure about your size? Try on at your local dealer!
| 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 |