MediDyne’s ProStretch NightSock helps alleviate heel pain associated with plantar fasciitis, Achilles tendonitis, calf muscle cramps and runners’ cramps. By keeping your foot in a slightly flexed position, the NightSock comfortably elongates the muscles and soft tissues of the calf and foot, speeding up recovery while you sleep. The lightweight, adjustable sock gives you overnight relief from the pain that comes with plantar fasciitis.