3M Icing Pack 2 packs Cold/Hot

When "cooling down", please chill in the refrigerator or freezer. When heating with boiling water, boil about 3 liters of water, turn off the heat, and soak for about 7 minutes. If the pack was stored in a cold state, please soak it for about 10 minutes. If you use a microwave to heat the water, first put water in a suitable container, soak the pack in it, and heat it for 30 to 90 seconds (about 90 seconds at 500W).Check the temperature of the water if necessary. While doing so, heat the mixture further for 10 to 15 seconds at a time. Please be careful not to heat it too much as it may damage the package. If stored in a cold state, bring it back to room temperature and mix well before heating.