This U-shaped hot water bottle is easier to use and more durable than the old rubber hot water bottles. The wide opening with a splashproof lip prevents splashes and spills. Innovative U shape lets you position the hot water bag in many ways for maximum pain relief. Made with high quality materials and careful craftsmanship for more durable insulation. Comfortable knit cover prevents hot water from coming into direct contact with skin. Perfect for soothing sore muscles or keeping warm on cold nights. To fill the shoulder hot water bottle, hold the bottle neck, stand upright and fill slowly. Fill only to 2/3 max capacity. Water temperature should not exceed 85 degrees. The long hot water bottle holds up to 1 liter. 14 1/2" x 12 1/2 x 1 1/2".