1. Bending the metal sheet, the liquid heating package will generate heat and gradually crystallize. Rub the heating bag by hand for about 3~5 seconds, so that the heating bag can radiate heat evenly, and then put it on the part that needs to be kept warm.

2. The maximum temperature of the heating package can reach about 50℃, so be careful not to burn the skin. (You can wrap a thin towel before use)

3. Put the heating bag into the pocket or wrap it with a towel to prolong the heating time.

4. When the heating bag is completely crystallized into a solid, put it in hot water and cook for about 5~ 15 minutes (put a cloth or towel on the bottom of the pot before putting the heating bag). After the crystal is completely melted into liquid and cooled, it can be recovered according to the above steps.