This full-face helmet with detachable chin guard and visor can also be used as a half face helmet. The in-mold construction makes it extremely durable, great equipment for mountain biking. Features: Detachable chain guard and visor makes the helmet switch easily between a half face and full face helmet. In-mold construction with hard polycarbonate shell and EPS lining for impact resistance and protection. 18 air vents take away excess heat to keep you cool and comfortable. Adjustable dial system fits head circumference: 54-61cm (21.2"-24"). Camera port and goggles port allow you to mount your camera and goggles on the helmet. Specifications: Material: PC + EPS Color: Black / Black Camouflage / Grey / Orange (optional) Head Circumference: 54-61cm / 21.2-24in Vents: 18 Weight: 520g / 1.1lb Package List: 1 * Bike Helmet