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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Key Features
Maximum Air Flow
Multi-channel ventilation system for maximum air flow
Aerodynamic
Aerodynamic design with durable ABS construction
Easy Comfort
Comfortable, breathable, and washable liner
D-Ring Closure
Padded chin strap with D-Ring closure
Safety Guaranteed
DOT certified with a starting weight of 1500 grams
Drag
Aerodynamic, comfortable, and breathable, the 509 Sullivan Helmet is ready to pack on the miles, no matter your riding experience. This DOT-compliant helmet has a wide field of view, comes in a range of sizes, and has been made with a durable, high-quality thermoplastic shell. Our multi-channel ventilation system allows for maximum air flow while a classic padded chin strap with a D-ring closure keeps it secure.
Key Features
- High quality thermoplastic shell
- Comfortable, breathable, removable, and washable liner
- Aerodynamic design for exceptional stability
- Optically superior wide field of view with 95% UV protected and fog-resistant shield
- Multi-channel ventilation system for maximum air flow
- Padded chin strap with D-ring closure
- Helmet ships with clear face shield only
- WARNING for California residents
Specs
- Helmet Certification: DOT
- Starting Weight: 1500 grams
- Best Head Shape: Intermediate oval fit
- Size Range: XS - 2X
- Shell Breaks:
Small shell - XS, SM, MD
Large Shell - LG, XL, 2X - Included items: 509 helmet drawstring bag, breathbox, 509 Sticker
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.
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.
