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. The light up wheels add an added layer of fun! No batteries required. 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.