509 Altitude 2.0 Carbon Fiber Helmet Size:4XL In answer to the call

In answer to the call

Active-fit sleeves for increased breathability and airflow

Mesh intercom: up to 8 hours

Dual density EPS

YKK® AquaGuard® RallyFlap chest zip converts the front zipper to an oversized intake vent

509 Altitude 2.0 Carbon Fiber Helmet Size:4XL In answer to the callReinvented 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