Perfect for growing kids who love to skate, these sharp-looking Roller Derby Trac Star adjustable roller skates supply performance and comfort. Each skate includes a push-button size modification system to accommodate growing feet.? Adjusts through three full sizes to grow with your child?Constructed of soft, yet durable vinyl?Built-in toe stop for safe and trusted stopping?Click right here to see our children's shoe sizing guide?Boot: Molded shell with hinged cuff, cam-lever buckle closure and washable liner?Frame: Lightweight patented torsion beam?Wheels: 54mm Urethane?Bearings: Excellerator 608ZB.