1.Easy to useThe thermos with wide mouth design prevents you from being scalded when pouring water. It's convenient, quick, and safe to pour water into a hot water bottle without spilling. Please pour two-thirds of the 80-degree hot water. Note: Do not use microwave to heat. 2.Health care materialThe hot water bottle is made of natural high-quality rubber, which is non-toxic and harmless. The explosion-proof, heat-resistant and aging-resistant properties of natural rubber are far superior to those of PVC. 3.Good HelperThe pain relief hot water bottle can be used as a hot or cold compress to relieve muscle soreness, menstrual cramps, sports injuries. The best gift for friends, loved ones and relatives. 4.ApplicationYou can insert your hand into the protective case to warm your whole winter