【Versatile Design】: U-shaped water bag for hot or cold compress therapy, ideal for shoulder, neck, and pain relief. 【Dual Functionality】: Serves as both a hot water bag and an ice pack for targeted heat or cold application. 【Relaxation Aid】: Provides soothing warmth or cooling relief to help relax tense muscles and alleviate discomfort. 【The perfect gift】: ensuring your safety, explosion-proof, and no need for electric heating; Allow the boiling water to cool slightly before pouring. Grab the neck of the hot water bottle. Slowly add water until 2/3 full. Slowly press out residual air and tighten the nut. Ensure no leakage before use. This hot water bottle is a thoughtful and comfortable gift for birthdays, Father's Day, Mother's Day, Thanksgiving, Christmas, and New Year. Hot water bottle, heated water bottle, comfortable U-shaped hot water bag, spine hot water bag, can be filled with hot water bag, knitted plush hot water bag, cold and heat therapy method bag, shoulder warm bag, hot water relaxation bag, neck and shoulder warm hand, suitable for home, office, etc.