LIGHTWEIGHT AND SHOCK-RESISTANT MATERIAL The skater helmet consists of a shockproof ABS shell with EPS foam padding. The weight is only 0.2 kg. The extra soft interior and chin pad make it comfortable to wear. ADJUSTABLE STRAPSThe skate helmet has an adjustment knob, you can adjust the inner circumference of the helmet by turning the adjustment knob. The head circumference adjustment range is 51-54cm, suitable for children aged 4-12 years old. EXCELLENT VENTILATION SYSTEMThe bicycle helmet has 14 vents which are breathable and comfortable , which reduces the child's feeling of heat during exercise and reduces the weight of the helmet. The child will not feel tired after wearing it for a long time. 2 REMOVABLE INNER LINERSThe sports helmet is equipped with two removable inner liners to reduce shock and damage by collisions during exercise. It is attached to the helmet with a Velcro closure, a total of 2 inner liners, easy to disassemble and clean. FOR MULTI-SPORTS AND GIFTChild protective helmets protect your children during the skating, skateboarding, in-line skating, cycling, scooter and other sports. Makes the perfect gift for children for birthdays and Christmas. Item dimensions L x W x H 26 x 22 x 9 centimeters