ITEM NAME:Reusable Cold Ice Hot Heat Gel NonToxic Pack Sports .Muscle Back Pain Rel Dcjf HOT SALE body .shopclass { float: left; width: 100%;.If it is not hot enough, reheat for 15 seconds to temperature. Hot water heating: hot and cold bag into boiling water for about 4 minutes, if the temperature is not enough, can be heated for 1 minutes!