Use in dress or athletic shoes to aid heel spurs, plantar fascitis, knee and back pain and Haglund heel. Duo-density, medical grade silicone ensures support and shock absorption. Softer silicone dots cushion sensitive areas. Retains resiliency and will not dry out. Hypoallergenic, nontoxic, odorless and washable. 1 Pair. XLarge. Men's 10 and up; Women's 12 and up.