This multisport helmet is great for either trail or park. The 3D molded design is sure to rock every kid's world. The chock absorbing EPS inner shell protects th noggin and while the aerodynamic cooling vents keeps your bucket fresh. Nylon straps adjust for the perfect fit. This helmet is CPSC 1203 Bike and ASTM F1492 Skate safety compliant. For ages 5-8. Fits head sizes 19.7-21.2" (50-54cm).