Watch them learn to skate as they grow in the Stryde Lighted Adjustable Inline Skates. Grippy, bouncy indoor/outdoor lighted polyurethane 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. *Adjustable sizing at the push of a button! Medium expands from size 2 to 5. Small expands from 11J-1. *Deluxe Comfort Liner, Locking Cam-Lever Buckle, Power Strap and speed laces.. *Fast Silver-5 Speed Rated (carbon) Bearings. *Reinforced Polymer Frame with Lighted Polyurethane wheels (Medium has 72 mm; Small has 64 mm). *Ventilation to keep feet cool; Brake on right skate.