Great for leg length inequalities, heel spurs and other clinical conditions. Helps restore normal contour, muscle tone and systemic function. Adjustable height reduces inventory. Durable and comfortable. Use with sports shoes and dress shoes. Not sold in pairs. Select mens or womens sizes. Small womens supports up to size 8 shoe size. Medium womens supports sizes from 8.5 and up. Mens medium is up to size 11 and a mens large supports size 11 and up.