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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One of the industry’s bestselling helmets ever, the 509 Altitude series excels across four key principles: safety, performance, fit, and style. Revolutionary design means precision fit and sleek profiling that exceeds the competition, plus innovative venting and all-day comfort for aggressive riding. The 509 Altitude Helmet features the MIPS Brain Protection System for ultimate safety, Fidlock® magnetic strap buckle for easy one-handed operation, plus customizable elements like a removable cold weather breathbox.
Key Features
- Removable vent stoppers for customized ventilation
- Comes standard with universal camera mount
- Comes standard with Fidlock® easy-open magnetic strap clasp
- Comes standard with our new Pro Series Liner and Cheekpads
- Comes standard with a cold weather breathbox
- Innovative aerodynamic channels & 8 intake/exhaust vent ports
- 11 Sizes across 4 outer shell molds ensure excellent fit, Youth SM - Adult 4X
- Meets and exceeds DOT & ECE 2205 safety certification standards
- One piece eye port trim
- Perfect 509 goggle fit
- Revolutionary neck brace ready shell profile
- Custom fit eps, specially designed for North America
- Special designed expanded polyurethane chin insert
- Removable, washable premium liner
- Dual density, interlocking eps
- DOT/ECE helmet weight from 1380 grams
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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 |