Use in dress or athletic shoes for heel spurs, plantar fasciitis, knee and back pain and haglund heel. Duo-density, medical-grade silicone ensures support and shock absorption. Softer silicone dots cushion sensitive areas. Lower profile thickness (4mm) offers patient comfort. Retains resiliency and will not dry out. Hypoallergenic., nontoxic, odorless and washable. Sold in pairs. 1-year warranty.