The Extra Boost *Corrects the Arch of The Foot and Improves Gait * Reduces Stress On Joints. Muscle and Tendons * Provides Shock Absorption And Relives Pressure at the Heel. Longitudinal arch and the Metatarsal Areas. * Comport & Pressure Relief is Provided During Walking. For Maximum Benefits. * Superfly Insoles Can be Fitted in Any Shoes. * They should be used while wearing socks. * Made from special fiber and EVA.