"Our unique world leading technology is now even more advanced to give maximum performance with every impact. Medical professionals recommend Sorbothane© Sorbothane insoles can help limit the trauma caused to a body during exercise, such as back problems, joint pain, tendonitis, fatigue fractures and knee pain. They help prevent the re-occurrence of old injuries and offer unrivalled comfort. Sorbothane© Technology Shockwaves are created every time your feet strike the ground, causing damage to joints, muscles, ligaments and tendons. Sorbothanes© unique visco-elastic material mimics the characteristics of human flesh, and at the moment of impact changes shape to disperse shockwaves sideways. Double Strike Features: ideal for activities where both the forefoot and heel are subjected to impact shock Suitable for all sports footwear Replaces existing insole Abrasion-resistant top sheet Available for shoe sizes UK 3-12.5 and EURO 35-4"