Engineered to provide protection from calf strains & achilles tendon injuries, the Sorbothane Shockstopper Heel Pad provide extra cushioning, shock absorption & 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 & 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 & away you go. Ideally suited for all shock absorption sports & activities, feel the difference & relief as muscle fatigue is reduced whilst less strain is put upon your joints, ligaments & tendons. From Football & football to athletics & tennis; these pads are ideally suited for all all levels of shock absorption sports & activities. Please note, the Sorbothane sizing is based on UK shoe sizes.