(16 Cooling Sheets) You can always have it at home. For sudden fevers, headaches, and when you want to be refreshed, or when you have trouble sleeping. Cool and comfortable. Vaporization heat with water filled gel will last for about 8 hours. Can be used as soon as possible for sudden heating. Perfect fit for your forehead and can be used without stress when you sleep. Weak acid sheets that are gentle on your skin. Can be used by adults and children. This product is not a medicine, so please consult a physician if the heat or heat is continued.