Double-Layer Protection: The bike helmet for kids is made of PC shell and shock-absorbing EPS foam, with an extended rear end for all-round protection, kids helmet bike meets both CPSC and CE safety standards. Helmet Fit System: Kids bike helmets have a round adjuster on the back, which can be toggled to fit the kid's head, the size of kids bicycle helmet ranges from 50-57cm/19.65 - 22.45 inches for kids 5-8-14 ages. Lightweight Comfortable: Boys and girls bike helmets have removable soft lining and the kids helmet is designed with 15 vents to keep cool. Lightweight youth bike helmet only 240g no extra burden for kids. Removable Sun Visor：Kids bicycle helmet features a detachable visor for flexible use in different riding conditions. Multi-Purpose Kid Helmet: Helmet bike kids with a helmet bag, perfect for riding, balance bike, skateboard and many other outdoor sports, ensuring safe and carefree fun for children.