About this itemHigh-quality Material: The helmet is crafted with ABS shell and high-density EPS liner, matched with durable nylon strap and thickened soft sponge. Besides, the other protective pads adopt anti-impact PP shell and breathable air mesh, ensuring the comfortable wearing experience. (Comply with CE & CPSC standards.)Ventilation Design: Comes with 11 air vents on the top of the helmet, offering good heat dissipation during exercising, which is able to make kids feel cool and comfortable even during intense body movement.Adjustable Size: Equipped with a professional turning knob, the helmet circumference can be adjusted for better fit and stable wearing. In addition, with the use of elastic straps for secure, the protective pads allow you to adjust the most suitable size to fit kids' knees, elbows and wrists.Designed for Kids Aged 3-10: The helmet is 20-21"/50-54cm in head circumference, and weighs lower than 17.6oz/0.5kg, which is suitable for 3-10 years old kids with the weight below 88lb/40kg. Please measure the kid's head circumference with measuring tape before purchase.Widely Used: This Kids Protective Gear Set consists of 2 knee pads, 2 elbow pads, 2 wrist pads, and 1 helmet, a considerate protective gear for children. Ideal for various outdoor sports, such as children roller skating, cycling, balance car, skateboarding and so on.