UNCOVERED Small 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 *