Activ-Step® 3Feet Work footbeds are designed to support common foot conditions which include: Plantar Fasciitis, Fatigue, Achilles tendonitis, Pronation/supination instabilities and Back and knee pain. They have been specifically designed for industrial workplaces and include anti-static stitching and tape for product assurances purposes. The footbeds are multi layered and built up to offered tailored arch support based on the wearers foot type. Size Breakdown: S = 4-5, M = 6-7, L = 8-9, XL = 10-11, XXL = 12-13