For athletic or casual shoes. Cushions impact, returns energy. Stabilizes the foot for better athletic performance with less foot fatigue. Seven sizes fit youth, men's 6-15, women's 3-10. For aerobics, racquet sports, volleyball and any other "start and stop" activities. Special cushion in the forefoot absorbs impact, shock and side-to-side friction. Seven sizes fit youth, men's 6-15, women's 3-10.