Material: The hot water is made of rubber, which ensures maximum safety and transfers the heat perfectly, maintaining the water temperature for a long timeLeak-proof: wide mouth for easy water filling, anti-spray lip to prevent leaks and spills, with screw-on lid for just A little tighter than finger tightWidely Used: Thermos bags are beneficial for relieving menstrual cramps, muscle and joint soreness, arthritis, and sports injuries. Heat therapy helps relax tired muscles and tense shoulders caused by stress and over-exerciseMaximum capacity of the heat viewing bag: 1000ml, it is recommended to fill the bottle to two-thirds of the way. Belt length: 44 inchesPackage includes: 1 rubber thermos, 1 awning, 1 belt