Heat therapy relaxes muscles and relieves joint pain and soreness. Increases blood flow to the injury area and helps accelerate healing. Warms and loosens stiff muscles before exercise. Aquifer: Timed-release moisture technology provides deeper heat penetration than dry heat alone. Moist heat is physician recommended. Menstrual pain relief arthritis pain relief muscle ache relief. Auto shut-off. 3 heat settings. Machine washable cover. 9 foot cord. Actual color of cloth cover may vary from picture on package. 12 inches x 24 inches.