With an updated design, the Bell(R) Adult Division Bike Helmet features cool skate style but with additional coverage for added protection and safety. The ABS hard plastic shell and EPS liner deliver a secure and comfortable fit while 10 vents let cool air to flow into the helmet for breathability during intense sessions at the park or in the city. The Bell(R) Adult Division Bike Helmet is bike and skate certified. FEATURES: Street skating and BMX bike helmet Classic skate style design Features a lower profile with a more curved shape on the sides and back for more coverage Ventilation: 10 vents Tough ABS hard plastic shell with EPS liner Bike and skate certified: CPSC Bicycle, CE EN1078, ASTM F1492-08 Skate Complies with U.S. CPSC Safety Standard for Bicycle Helmets for persons age 5 and older SIZING: S: 51-55 cm M: 54-59 cm L: 59-61.5 cm