Helps relieve discomfort and pain caused by heel spurs, plantar fasciitis and Achilles tendonitis. AirCast Silicone Heel Cups are recommended to help reduce shock and vibration loads to joints and lower back. Softer center in heel region to reduce strain to areas sensitive to pain. Medical grade soft silicone for optimal shock absorption and comfort. Long lasting, soft silicone retains shape for long term support and comfort. The cups are sold in pairs.