Caldera Rib/Back Therapy Wrap Muscles require proactive and reactive care. Soothe muscle aches and pain the the Caldera Therapy Wrap. This wrap features elastic extensions to fit most people. It includes two 6''x10'' therapy gel pacs that work in both hot and cold and are microwave and freezer safe, reusable, pliable and non-toxic. Ideal for back and rib applications. The breathable sleeve has an adjustable fit contour and is made of machine washable anti-bacterial fiber. Give your body the care that it needs with the Caldera Therapy Wrap.