DOT safety standard: the new design makes you look cool and fashionable, high density ABS (Acrylonitrile Butadiene Styrene), it can be high pressure and Strong wearing. The motocross helmet comes with protective glasses and gloves and can offer you all-round protection. Helmet size: S; Adult (cm): 52-55 inches: 20.47 inches - 21.65 inches; helmet size: M; adultcm): 56-57 inches: 22.04 inches - 22.44 inches; helmet size: L Adult (cm): 57-58; inches: 22.44 inches - 22.83 inches helmet size: XL; Adult (cm): 59-60; inches: 23.22 inches - 23.62 inches.