2 SKATES IN 1! Switch between Quads and inline skates for the best of both worlds GET GOING: Comfy, supportive boots are great for beginners SMOOTH ROLLING: Roller Derby skates feature grippy indoor/outdoor urethane wheels loaded with speedy silver-5 bearings THE REAL DEAL: Quads have real trucks for control; Inline skates have non-marking brake on right skate OUTGROW NO MORE! Adjustable sizing for growing feet: Medium fits shoe sizes 3 to 6. Small fits shoe sizes 12 to 2.