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