HJC Link Men's CS-MX Motocross/Off-Road/Dirt Bike Motorcycle Helmet - MC-3 / 2X-Large Polycarbonate Composite Shell Lightweight, superior fit and comfort using advanced CAD technology ACS Advanced Channeling Ventilation System Full front-to-back airflow flushes heat and humidity up and out the rear of the helmet DOT FMVSS 218 Certified