It cools quickly when you fold it, and cools quickly anywhere. Secret to Chilling: Urea and ammonium nitrate in the bag will react and dissolve when it comes to water. When melting, the ice pack becomes colder by stealing the surrounding temperature (heat absorbing reaction) (Easy to Use) Place the ice pack on a flat surface, tap the outer bag tightly, and break the packed inner bag, the liquid in the inner bag will melt the granular coolant and start cooling. *Shake and crumble the bag several times to shorten the cooling time. Standards: W 4.7 x D 0.8 x H 7.9 inches (120 x 20 x 200 mm); Weight: 6.3 oz (190 g); Uses: For carpenters, foundation construction shops, roofers for heatstroke, distributing customers at field exhibitions, for fevers, hammering, and burns; A leisure companion. Can be used for a wide range of activities such as watching sports during hot events, or when it gets hot. Note: This product is not food or drinking water, so please do not put it in your mouth. In the event that the bag breaks and the liquid content gets on your skin or clothing, please rinse it off with water. Store at room temperature. The temperature will suddenly fall below freezing point, so please wrap it with a handkerchief or towel when exposed to the body. (As this product may cause frostbites if it is placed directly on the skin, please be careful when using it for infants and those with weak skin. )