The Superfeet® Run Support Medium Arch insoles add stability and comfort to your running shoes, reducing stress on feet, ankles, knees, and back. They improve efficiency, reduce fatigue, and support every step. These medium-arch orthotic support insoles feature a responsive EVOLyte® carbon fiber cap and two layers of Aerospring™ Rebound foam that are combined to deliver exceptional comfort and smooth and efficient energy transfer through your gait from foot strike to toe-off. They are made to replace the removable liner in roomy to moderate-fitting running and walking shoes. Their Moisturewick™ top cover helps reduce odors and keeps feet fresh, while the heel cup positions and cradles the heel to optimize natural shock absorption and minimize fatigue. Made of Ethylene-Vinyl Acetate (EVA), these gel insoles are designed with a stabilizer cap with a polymer blend that responds to compression, springing back to its original shape for responsive, weight-defying support.