Sidas Gel Heel Cups These close-fitting gel heel cups absorb shocks all day long for optimum comfort. The Sidas gel heel cups are specifically designed to fit perfectly around the heel, helping to prevent blisters and enabling you to perform at your ultimate best. The heel cup also works to stabilise the feet, preventing the risks of repetitive injury. Additionally, the gel heel pads work to absorb shocks for maximum comfort. By reducing the impact when the foot strikes the floor, any potential damage to your foot will be reduced. In the case of existing pain, the gel protects the feet from impact by absorbing the shock, helping you to perform even when injured.