... 48~50°C)(2) WHEN THE HEAT PACK BECOMES COLD, PLEASE PUT INTO THE BOILING WATER FOR10 MINUTES,THEN ... INTO LIQUID CONDITION, AND BECOMES SOFT. AFTER IT BECOMES COLD, IT CAN BE USED AGAIN.(3) WHEN YOU USE ... USED. 2.WHEN TO USE:(1) SNOWING, HUNTING, CLIMBING COLD WEATHER. OUT DOOR USE.(2) ON THE WAY TO OR BACK ... of two or more months.For Use as a Cold PackChill pack in refrigerator, but DO NOT store in ...