Durable & Safety - 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. Small Size15*5.5*9.5cm .The smaller size is more suitable for children to use in winter or when cold compresses are needed. Adults can also carry it with them. It is compact and convenient. 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 320ml, suggested to fill to two-third. Comfortable Plush Waist Cover - Comes with a Knitted warmer. Helps to prevent the heat from contacting your skin directly, which can cause burns. Multi-functional Usage - Our hot water bottle bag works great for pain relieving, arthritis, sports injuries. Hot therapy helps to relax your tired muscles and tensed shoulders from stress and too much workout. They can also be used for cold therapy, easy fill in cold water or crushed ice.