Moisture-rich gel absorbs heat quickly, cool and comfortable cooling sensation blend, gentle on the skin during sudden heating, weak acidity, skin temperature -4°F (-2°C), lasts approximately 8 hours *What is the secret of a hot sheet that is loved by cooling in an indoor 67°F (25°C) environment on the back? The gel sheet of the pull pull pull pulls quickly absorbs heat and makes you feel cool. *If the seat is hot and wet it will keep the cooling effect well. The gentle acidity is gentle on the skin, so you can use it at any time. The cooling power of the skin surface temperature of -4°F (-2°C) will last for about 8 hours. The reverse side of the product has been tested in a cooling temperature of 77°F (25°C), so it can be used in such places such as when you want to cool down in a cold situation, such as fevers, headaches, toothaches, and even on those uncomfortable nights of sleep, and for hot skin after sports.