Injection molded, high density shell for optimum protection from impacts. EPS CPSC certified foam lining for safety and comfort. Protec helmets also come with two custom sizing pads for additional fit adjustment. Imported. Sizes: S (20.9" to 21.3"), M (21.7" to 22"), L (22.4" to 22.8"), XL (23.2" to 23.6").