1. Instant hot pack Usage: Product provides heat on it's own when it is exposed to the air, and can provide hot more than 8 hours. A good companion for outdoor work, activities and sports, such as camping, hunting, fishing, skiing and skating, and for use whenever and wherever hot therapy is needed. If you want know more about us, please welcome to visit our website. 2. Features: 1) It can provide hot more than 8 hours. 2) Ave. Temperature: 52 centigrade 3) Material: Iron powder, water, cellulose, salt etc... 4) Product provides heat on it's own when it is exposed to the air. 5) Convenient, portable and safety. 6) A good companion for outdoor work, activities and sports, such as camping, hunting, fishing, skiing and skating; For use whenever and wherever hot therapy is needed, such as Myalgia, lumbago, internal injury caused by overstrain, sciatica, sprain, contusion and pain caused by cold Stomachache, dysmenorrhea, warming uterus of lying-in women. 3. Way of use: 1)Open the plastic out pack and expose the pad to air. 2)Remove protective backing place pad, and stick it directly onto inside of Clothing(don't not apply direct to skin). The pad will take about half a hour to take effect. 3)After use, put it into refuse bin.