The Ion 7.2 has high-end features for a great skating experience. The hybrid design allows the comfort of a soft boot with the support of strong ankle cuffs and stealthy aluminum frames. Grippy, bouncy indoor/outdoor Urethane wheels with speedy Silver-5 bearings ensure a smooth, quiet and confident ride. Designed to grow with your child, the Ion 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.