1.Keep You Warm for Long - Thickened High Density PVC Thermos with Lid is made of rubber which helps to keep the liquid temperature and keep the heat longer than traditional silicone thermos. Fill the bottle with hot water, place it in bed up to 10 minutes before bed, and our thermos will prepare you for a warm and wonderful sleep.2. Multifunctional Thermos - A hot water bottle can be used alone to treat aches, pains and sports injuries such as back, neck and shoulder pain, muscle soreness, menstrual cramps and tension (pain during quiet periods). In addition to traditional heat therapy, it can also double as a cold compress for a child with a fever or as a swelling relief for minor injuries. (do not use microwave to heat)3. Lovely Protective Cover - Comes with a soft detachable knitted cover that helps isolate hot water and maintain its effectiveness for 6-8 hours. It also protects the thermos from bumps and dirt and keeps your thermos last longer. The lovely and charming pattern on the lid makes the thermos a thoughtful and comfortable gift for mothers, fathers, children, friends, on Mother's Day, Thanksgiving, Christmas and New Year's Day.4. Easy to use - let the boiling water cool slightly before pouring (don't use boiling water). Grab the neck of the thermos. Slowly add water to 2/3 full. Slowly press out the trapped air and tighten the nut. Make sure there are no leaks before use. Package includes: 1 rubber thermos, 1 soft knitted sleeve.5. Note: It is recommended not to directly touch the skin after the hot water is injected, so as to avoid burns, and it is safe to use at a suitable temperature.