The Bell Injector helmet offers dual-certified protection in bold new graphics/colors so it's perfect for BMX, mountain biking or skating to school or any other sport that requires protective headgear. Bell's classic hard-shell construction offers protection on the trails or at the skate parks. Ten air vents cool your head fwith front to back air flow and the channeled sidewalls enhance impact performance. The helmet meets or exceeds CPSC and ASTM safety standards. For ages 14 and up. Fits head sizes 21.6-23.2" (55-59cm).