The Onyx Cool Back/Hip features a plant-based cooling phase change material (PCM) in a wearable therapy for back, hip and belly pain. This versatile wrap delivers 80 degrees therapy for sports injuries; pregnancy back and belly pains; post-surgical relief and C-section recovery. This cool (not too cold) device is safe to wear directly on the skin without risk of ice burn, frost bite or vasoconstriction. Cooling PCM safely permeates tissues to relieve pain and draw heat and inflammation away. Maintains constant 58 degrees cooling for about an hour, depending on use. Re-cools in the refrigerator in 30 minutes. Latex-free and made in the USA! To clean, wash with mild soap and water then air dry.