Raskullz Hawk Mohawk Black Bike Helmet, Child 5+ (50-54cm): 3D rubber mohawk,\xc2\xa0 adjustable straps and aerodynamic cooling vents. Radical printed graphics Recommended for kids 5-8 years old. (50-54cm) Complies with the U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older. Also complies with U.S. ASTM Safety Standard for multi-impact Skateboard Helmets. Shell: PVC\xc2\xa0 \xc2\xa0 Interior: expanded polystyrene foam