What are Sorbothane&174; Single Strike Insoles? Replacement shock absorbing insoles with extra cushioning Sorbothane&174; material in the heel area. When can I use them? Perfect for sports & leisure activites, especially running, rugby & cricket, where there is stress on the heel. For the treatment & prevention of heel pain, Plantar Fasciitis, Achilles tendonitis, & calf muscle injuries. Which size do I need? Sorbothane's sizing is based on UK men's shoe size. Shoe Size Conversion Chart How do they work? Sorbothane&174; is a unique synthetic material which absorbs 94.7% of the shock waves caused by the foot striking a hard surface. This means it reduces muscle fatigue, helps protect weak joints & eases the strains on ligaments & tendons. Simply fit the Sorbothane&174; Single Strike Insoles in place of your existing insoles to reduce stress on the back, hip, knee & ankle joints, as well as the muscles & tendons of the lower limb. Matthew Hoggard, England International Cricketer: " With the level of stress I place on my feet during a match, Sorbothane&174; Insoles help give me that bit extra." Alternatively for something different why not try the Noene 2mm Shock Absorbing Insoles.