Pain and sore muscle relief! Super fast heating penetrates hurting muscles and cramps in seconds! The electric moist heat pad makes its own wetness by drawing moisture from the air to the flannel cover and then to the cooler treatment area. This quality heating pad is perfect for pain relief. The electric pad provides moist heat without adding water (fomentation). The hand controller digitally adjusts temperature and treatment time. The pad includes a flannel cover. 110V.