Two skates for the price of one! A quickly interchangeable chassis allows you to switch from quad roller skates to inline skates and back with ease. You can switch out the frames by using 2 Allen wrenches. The green and black boots are comfy and supportive. The boot also features adjustable sizing for growing feet and expands up to 3 sizes with the push of a button. Fits true to children's U.S. shoe sizes. Medium adjusts from size 3 to 6. With these versatile skates, you can enjoy all that skating has to offer! Roller Derby® is America's Skate Company since 1936.