The PCH Yellow reusable pad retains its warmth or cold for up to one hour, 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 or freezer 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!