Specially designed to improve foot posture and relieve stress on your ankles, knees, hip and lower back. Excellent for all sports activities - running, walking, hiking, standing and high impact sports. The insole has a deep-cushioned heel cup with sides contoured to the shape of the foot and supported by the nylon shell. The heel cup base is a high-density polyurethane material that absorbs the foot's weight-bearing pressures. The firm heel cup sides help stabilize the heel to reduce friction that results from lateral foot movement. The arch support stabilizers and supports the arch area to help hold the foot in its natural alignment and prevent the arch from falling. The firmness of the contoured nylon shell helps the arch support accomplish these special features.