UNCOVERED * Large 1 Pair * Dual durometer for maximum comfort while standing walking or running * Medium-durometer silicone in main body efficiently absorbs impact and recovers quickly * Softer silicone blue zone under heel center maximizes shock absorption and comfort at point of impact * Retains shape - will not deform or degrade with use * Optional anti-microbial cover absorbs odor prevents bacterial growth and allows foot and insert to slide easily into the shoe * Washable and reusable *