Our U-shaped hot water bag is ideal for treating muscle pain, stress, shoulder pain, stiff neck, and other common pains. It comes with a soft and removable flannel cover to insulate the hot water and protect the bag from bumps and dirt. Made with high-quality PVC material, it retains heat for longer. Additionally, it can be used as a bed warmer or for cooling off in the summer. Easy to use and safe at the appropriate temperature. Perfect as a gift for family and friends.