1. Leak-proof/Explosion-proof - The hot water bottle adopts custom high-sealing cap, which will not leak. PVC does not have the pungent smell of a rubber thermos. PVC thermos has flame retardancy, high strength, weather resistance and excellent geometric stability. Will not be easily damaged, high quality, long service life, safe and reliable. 2. Hot and cold compress - Wide mouth hot and cold thermos is easy to fill and use. Hot water bottles for pain relief are versatile. Gift for muscle aches, pressure or cramps, arthritis, pain, stiff neck, lower back pain, menstrual cramps in women and other common pains, also serves as a cold compress for people suffering from fever or to reduce swelling from minor injuries. 3.Keep your feet warm at night - The hot water bottle can warm your feet in winter, perfect for pregnant women, babies and if you hate the cold or camping. Fill it with nearly boiling water, place the thermos under the blanket and it's a comfortable bed when you walk in. 4. Winter choice - The best warm choice for winter travel, camping, hiking or other outdoor activities, protect your hands other skin prone to frostbite. Comes with a soft hot water bottle cover to prevent burns from direct skin contact with the hot water bottle. A thermos is a warm gift for friends and relatives on Thanksgiving and Christmas.