3-IN-1 DESIGN - This upgraded hot water bottle has 3 parts including a 1 liter hot water bottle, a cute waist belt and a hydration cover, bringing warmth to different parts of the body after filled with hot water. What a perfect gift for girls and women.DURABLE AND SAFE - WARMTUYOU hot water bottle pouch is made of premium PVC for maximum safety and perfect heat transfer. We recommend that the temperature of filling water does not exceed 80 degrees Celsius.COMFORTABLE AND SOFT - Waist cover is made of fleece with double inserts for extra soft comfort while keeping your hands, waist warm. The hydration cover helps prevent the heat from coming into direct contact with your skin, which can cause burns.EASY TO FILL AND POUR WATER - Equipped with a leak-proof stopper to prevent hot water from spitting out, our hot water bag features a wide opening to allow water in and out easily and safely. The maximum capacity is 1000ml, while it is recommended to fill it to two-thirds.VERSATILE APPLICATIONS - Adding hot water for hot compresses provides comfortable, lasting warmth to your neck, shoulders, back and abdomen on cold winter, especially for teenage girls or ladys in special periods, helping relieve menstrual pain and creating a relaxing atmosphere. This water bag can also be added cold water or crushed ice for cold compresses to ease pain of sprained ankles and sore muscles, so convenient and simple.