Injected PowerBridge energy absorber. Lightweight polymer shell available in three sizes. Docking port for sunglasses for easy and secure storage. Fidlock magnetic closure system. 360° turbine technology reduces peak brain acceleration by up to 30% at impact speeds associated with concussions. Reduces the maximum rotational acceleration of the brain by up to 40%. Adjustable visor with breakaway function to reduce rotational impact force. In-molded impact foam for excellent energy absorption. Maximum ventilation with 20 vents that are effective even at low speeds. Moisture-wicking, breathable, odor-resistant, and washable inner lining. Certified and tested: AS/NZS 2063:2008, EN1078, CPSC 1203. Weight: 350 g. Sizes: S (51-55 cm), M (55-59 cm), L (59-63 cm).