HJC IS-17 Helmet Advanced 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 Chin bar intake vent provides airflow across the shield interior to help eliminate shield fogging SuperCool Moisture-Wicking Interior - Removable and washable crown and cheek pad liner system DOT FMVSS 218 Certified