Watch them learn to skate as they grow in the stryde adjustable inline skates. Grippy, bouncy indoor/outdoor urethane wheels with speedy Silver-5 bearings ensure a smooth, quiet and confident ride. Designed to expand with growing feet, the stryde adjusts up to four full sizes at the push of a button. Size small adjusts from children's shoe size 11j to 1 and has 64 mm wheels. size medium adjusts from size 2 to 5 and has 72 mm wheels. Roller Derby® is America's skate company since 1936.