Insite Insoles offers the Fusion Elite Insole, with a semiflex shell. Its composite shell material is strong but more flexible than the carbon fiber shell of the company’s Carbon Pro insole. It features two layers of foam materials—one to decelerate force and another to transfer energy back to the athlete. The Fusion Elite provides moderate support for pronation and supination while absorbing extreme impact to muscles and joints, which can help prevent overuse injuries. Available in eight sizes (corresponding to shoe sizes ranging from women’s 3 to men’s 17.5), Fusion Elite Insoles retail for $54.99 per pair.