Studies show that a common cause of knee, leg and back pain is poor foot alignment. This product helps correct poor foot alignment to promote relief of knee, leg and back pain. You'll feel a dramatic difference from the very first step. The triple-action design aligns your foot, provides comfort and supports the three zones of your foot: ball of foot, arch, and heel. 3/4 length to allow toes to move freely inside the shoes and prevent cramping. Made with Vita-Foam technology. Cradles ball of foot and prevents that burning sensation. Comforts and supports arch. Cushions heel from impact.