Xtreme Airmax Grey/Black Large Race Off-Road Helmet State-of-the-art (Advanced Resin Technology) shell construction integrates the very latest Polycarbonate mold technology with advanced Thermo Resin resulting in strength, integrity and flexibility in a lightweight package. Flexible, vented, contoured roost guard 3 massive flow-thru visor ports direct air into the crown vent and minimize 'lift' at high speeds Two shell sizes, two internal EPS sizes and seven size options maximize the weight and fit for each model Exclusive crown vent with 3-position intake (closed, intermediate and fully-open)