Snap on and cool and quick cooling. Perfect for outdoor activities in summer. When you hit the bag to sudden heat generating or bruising first aid, it will continue to maintain a moderate cold sensation temperature. How to Use: Check the inner bag inside this bag with your fingertips, place it on a flat surface and tuck the inside of the bag slightly firmer and break the inner bag. When the inner bag is broken the chemical will melt and start cooling, so please shake it lightly 2 or 3 times before using. *Put it in the fridge and you can use it again and again. Precautions for Use: This product is not grocery or drinking water. Never put it in your mouth. In the event that this product is swallowed, please drink a large amount of water and discharge it. If it gets into your eyes, immediately rinse with water for about 15 minutes. Consult a professional and consult a medical immediately after first aid procedures. In the event that the liquid from the bag breaks onto your clothes or skin, please rinse it thoroughly with water. Please do not squeeze the outer bag. Please be careful when using in situations such as infants and other situations where they cannot be taken out immediately by themselves.