Use hot water rubber bag as a natural body warmer in winters and also for heat therapy treatment in case of joint pains, muscular cramps, menstrual pains, muscle pull, stomach and back aches, arthritic and rheumatic pains, sport aches and pains. It is an ideal bed warmer soothing for both children and elders material: rubber, unlike other unreliable water bags, its can resist the hot water pressure comfortably usage instructions: add hot water , close the cap. used for heat therapy treatment guaranteed rubber hot bag, leak proof, colorful, easy to clean & keep water hot for longer time. Treats muscular pain, induces relaxation, releases stress used for heat therapy treatment