Roller Derby Prodigy Inline/Quad Combination Skates are great for beginners who want the best of both worlds: quad and inline skating! The boot comes 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. Roller Derby is America's Skate Company, since 1936.