Durable & Safety - KUYOU hot water bottle is made of rubber to ensure maximum safety and transfer the heat perfectly, keeps the water warm for a longer time. To be more safety, the temperature of the hot water should not exceed 80 degrees celsius Wide Bottle Nozzle - Comes with an anti-squirt stopper, safety and easily let water in and out, prevent water spitting back out. Our hot water bottle maximum capacity 900ml, suggested to fill to two-third Comfortable Plush Waist Cover - Comes with a plush waist cover, designed with super soft double insert, keep warm to your hands and waist at the same time. Helps to prevent the heat from contacting your skin directly, which can cause burns