Material: the hot water bottle is made of high quality rubber materials, wear-resistant and heat-resistant, transfer the heat perfectly, long service life. with plush cover: comes with a plush waist cover and hot water bottle cover, keeping warm to your hands and waist at the same time. avoid burns caused by directlyâ  the hot water bottle. safe & anti leak: wide mouth for easy fill, anti spurt lip to prevent leakage and spills, pressure-tolerant and leak proof. widely used: suitable for relieving cramps, sore muscles and joints, arthritis, stiff necks, lower back pain, etc. besides, hot helps to relax your tired muscles and tensed shoulders from stress and too much workout.