Roller Derby Sprinter Inline/Quad Combination Skates for girls are great for beginners who want the best of both worlds: quad and inline skating! The skates come with interchangeable frames that convert from quad to inline. The boot features adjustable sizing at the push of a button to help keep up with growing kids. Soft comfortable padding is included in the boot and molded ankles offer lasting support. Quick-latch buckles are easy to use with no laces to tie. Multi-surface polyurethane wheels roll smoothly indoors and outdoors. Silver-5 bearings roll fast and smooth whether on the street or in the rink. Fits true to children s U.S. shoe sizes. Small adjusts from size 12-2. Medium adjusts from size 3 to 6. Roller Derby is America s Skate Company since 1936.