1.Leak-proof/Explosion-proof- The hot water bottle adopts a customized high-sealing stopper, which will not leak. PVC doesnt have the pungent smell like a rubber thermos. Thermos made of PVC has non-flammability, high strength, weather resistance and excellent geometric stability. Will not be easily damaged, high quality, long service life, safe and reliable. 2.Hot Cold Compress- The wide mouth hot and cold thermos is easy to fill and use. Hot water bottles for pain relief are versatile. Gift for muscle soreness, pressure or cramps, arthritis, aches and pains, stiff neck, low back pain, menstrual cramps in women and other common pains, also doubles as a cold compress for those with a fever or to reduce swelling for 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 near-boiling water, put the thermos under the blanket, and its a comfortable bed when you get in. 4.Winter Choice- The best warm choice for winter travel, camping, hiking or other outdoor activities, protect your hands or other exposed skin from frostbite. Comes with a fluffy 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 parents on Thanksgiving and Christmas.