The Marvel Iron Man Bike Helmet features a molded 3D design to model the movie character realistically and make your child look like a modern day knight in high-tech armor. In terms of safety it has a shock-absorbing EPS inner shell and there are aerodynamic cooling vents to keep your kid comfortable. This Marvel bike helmet includes nylon straps that adjust for the right fit. The inside band fits heads 50 to 54 cm in diameter. 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.