Reusable therapeutic hot & cold for use with common aches pains swelling and bruising. Packs are designed to retain a therapeutic temperature for approximately 20 minutes. Combines the healing power of hot and cold therapy into one convenient pack. Enjoy extraordinary relief from your everyday aches and pains and feel the optimal therapeutic benefits as our Pearl Technology conforms to your body. Doctor designed. Freezes & microwaves reusable & non-toxic latex lead and BPA-free.