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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The 509 Tactical 2.0 Enduro Helmet offers the latest in technology and safety from our bestselling Tactical Offroad Helmet family. Innovative features for optimal airflow and comfort combine with industry-leading safety and performance to make this the greatest deal going in dirt. Its unique performance includes Venturi Venting with shutters you can open or close to create negative pressure that pulls moist air out for uncompromising comfort and visual clarity.
Key Features
- Durable polycarbonate shell
- Innovative Venturi Vent pulls moist air from helmet without cold wind coming into helmet → Learn More
- Double D-ring chin strap closure
- Adjustable visor with Lifetime Warranty
- VEES Protection system (sold separately) can be used for cold weather, and winter conditions → Shop VEES Protection System
- On/Off shutter inside helmet
- Soft microfiber liner for quick drying and comfort
- WARNING for California Residents
Specs
- Helmet Certification: DOT
- Starting Weight: 1300 grams
- Best Head Shape: Intermediate oval fit
- Size Range: XS - 4X
- Shell Breaks:
Small Shell - YSM, YMD, YLG, XS
Medium Shell - SM, MD, LG, XL
2X Shell - 2X, 3X, 4X - Included items: 509 helmet drawstring bag, 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.
