You Always Bring Heat - Designed for explosion-proof protection that can withstand over 1000 lbs of pressure, the grid-textured surface retains heat longer than traditional rubber bottles. Anti-slip and anti-scald, with a soft and stylish knit cover, avoid direct contact with your skin to cause burns and keep warm for 2-6 hours. Pain Relief Family Use - A hot water bag can keep the whole body warm, cure sore muscles, lower back pain, stiff neck, menstrual cramps, tension, cramps, also as a cold compress for feverish children or to reduce swelling caused by minor injuries. Multifunctional Hot Water Balloon - Odorless and recyclable food grade thermoplastic material. Wide mouth, easy to fill with water, also works as an ice pack or cold water bottle. Microwave Heating - Can be heated in the microwave oven, remove the knit lid and fill with cold water. The heating time is 1-2 minutes, and the heating power should not exceed 800W. With tested, no risk of leakage and explosion. Fill it with cold water and then put it in the refrigerator, you will get a bag of ice. Practical Small Gifts - It is the best gift for children, friends or families. The hot and cold water bottle can be used in different seasons. It can keep you warm in cold weather, it can also be used as an ice pack.