The Opal Cool One delivers 58 degrees cooling therapy to help treat injuries and relieve back, hip, and belly pain. Wearable therapy designed to relieve cramps, body aches, and pains including sports injuries. Wear during pregnancy to support the back or belly area and relieve prenatal pain; use post-partum for c-section recovery. Refreshes in the refrigerator in just 30 minutes. Stays cool approx. 60-90 minutes. Latex free. To clean, wash with mild soap and water then air dry.