Engineered to provide protection from calf strains and achilles tendon injuries, the Sorbothane Shockstopper Heel Pad provide extra cushioning, shock absorption and lift to the heel region. By simply placing the pad on top of your existing insole, this helps to alleviate the stress placed on your legs as your heel strikes the ground. So just how exactly does such a small piece of padding help reduce injury risks to your calf and achilles? Well, Sorbothane is a unique synthetic material which mimics the characteristics of human flesh, which at the moment of impact changes shaper to disperse shock waves sideways rather than towards your legs.Simply fit the Sorbothane Shockstopper Heel Pad atop your existing insole and away you go. Ideally suited for all shock absorption sports and activities, feel the difference and relief as muscle fatigue is reduced whilst less strain is put upon your joints, ligaments and tendons. From rugby and football to athletics and tennis; these pads are ideally suited for all all levels of shock absorption sports and activities. Please note, the Sorbothane sizing is based on UK shoe sizes.