4 SIZE ADJUSTABLE SKATES:Small fits US little kids shoe size 9-12. Medium: fits US big kids shoe size 13-3. The Kids adjustable roller skates size can be adjusted. Perfect for growing children..DURABLE PU WHEELS: Impact-resistant polymer plastic boot and durable PU 54mm x 32mm wheels offer added durability, high performance ABEC-7 bearings ensure a smooth and comfortable ride..TRIPLE PrROTECTION SYSTEM:The kids skates is with velcro strap, high-strength buckle and laces, triple protection measures to promote the safety for skaters. Double brake design, easy to grasp the balance, greatly increases the safety and stability. Very suitable for beginners who want to learn to skate..TOTAL COMFORT:The classic high-top sneaker style skates, features soft padded collars and lined boots to ensure your child enjoys a super comfortable and supportive fit. Safety ratchet buckle, power strap and laces up closure provide skater a safer condition when using our roller skates..PERFECT CHRISTMAS GIFT FOR KIDS:Roller Skating is loved by children of all ages and fun for adults, too. This ia ideal pair of roller blades you'll be happy to hold on for kids as a gift.