The PCH Blue reusable pad retains its warmth or cold for up to two hours, easing muscles into more relaxed states. Direct applications of heat can help alleviate muscular pain and provides relief from pain or stiffness caused by tense or sore muscles. The PCH reusable Back pad can be put in the fridge to be used as a cold compress for pain and swelling. The versatile back pad accommodates to your needs, by providing instant heat or cold when you need it and can be used on many parts throughout the body; it is designed to fit perfectly along your back regardless of your position. The best part is that you can take it with you anywhere you go, it is perfect for travel! To reuse, wrap the pad around a cloth and submerge in a pot of boiling water. The pad will turn clear once all crystals are dissolved. This indicates that it is ready to be taken out of the water and cooled. Once cooled, it's ready to be used again. Provides up to two hours of heat or cold Reusable heating pad with versatile design capable of providing relief for any area on the body Direct applications of heat or cold can help alleviate muscular pain and relax as well as soothe any tight or sore muscles Suits therapeutic relief of back pain, muscle pain, arthritis and sports injuries Stimulates blood circulation to the brain, relieving tension, stiffness, headaches, and chest pains