Performance Shockstopper Range - Designed for active people who want to prevent injury.As thousands of runners, walkers and athletes can already testify, Sorbothane Shockstoppers help you put your best foot forward by reducing muscle fatigue, protecting weak joints and easing the strains on ligaments and tendons.Especially suitable for heel intensive activity. Optimum balance between heel protection, weight and cushioning. Suitable for sport, leisure and outdoor footwear. Replaces your existing insole