Even the sky won't limit your riding in the 509's new game-changing Atmosphere Helmet where durability, advanced safety, and ventilation converge for uncompromised performance. 509 Atmosphere Helmet Details: Injection Molded Polycarbonate Shell - Built for performance combining durability and minimal weight Dual Density EPS Foam - Added safety with inner foam to absorb transferring energy and protect Ventilation & Airflow - Six (6) intake vents and six (6) exhaust vents for optimal airflow Removable Liner & Cheek pads - A plush interior easy to make fit adjustments and remove to wash Double D-ring Chinstrap – The adjustable strap offers a simple and safe custom-fit Specs: Certified: DOT & ECE 22.06 Starting Weight: 1250 grams Best Head Shape: Intermediate Oval Size Range: XS - XL Shell Breaks: Large shell - XS, SM,MD & XL Shell - LG, XL Universal camera mount Replaceable Polycarbonate Visor Includes: 509 Helmet Drawstring Bag