Children's helmets are not only devices to protect children's safety, but also toys or role playing props Shark helmet adopts high-quality PC shell, the shell adopts In Bold helmet technology, and the inner shell adopts EPS foam film. Professional design and unique structural features improve the durability of children's helmets, while providing comprehensive protection, shock absorption and impact resistance each time you use them Multi sport function do you always change their helmets when they play every sport or outdoor activity? Now you can make your choice easily. Our 3D children's shark helmet is perfect for any outdoor sport or activity. From skating, cycling, motorcycle riding, horse riding, skating, skating, and even mountain climbing, this revolutionary children's game helmet is very suitable for use S: The head circumference is 50-54cm, suitable for children aged 3-6 years,M: Head circumference 54-58cm, suitable for children over 7 years old