The Therapearl Contour Oval Wrap is perfect for sore knees and ankles, wrists and hands, shoulders and chest. The revolutionary Pearl Technologyâ„¢ absorbs heat and cold while the soft, pliable pack stays clean and dry against your skin. Itâ€™s hypoallergenic, non-toxic and reusable. Chill it in the fridge or freezer for analgesic cold, or pop it in the microwave for penetrating heat. The pack holds its therapeutic temperature for a full 20 minutes. When youâ€™re on the go, pain relief can go with you.