Raskullz Dinosaur Helmet (Radgon Red, Ages 5+) CPSC ASTM certified: complies with CPSC and ASTM standards for bicycle helmets^ Ages 5 and up (Fits heads 50-54cm)^ Comfy adjustable nylon chin strap^ Aerodynamic cooling vents^ Shock-absorbing EPS inner shell protects the noggin^ Molded 3D helmet design rocks every kid's world Molded 3D Helmet Design Shock absorbing EPS inner Shell Adjustable Straps Aerodynamis Cooling Vents Radical Protection & Design Perfection