Leak proof heat retention: the sealing design prevents any leakage. Fill twothirds of the rubber hot water bag with 80degree water, secure the cap, then turn it upside down to check the seal and enjoy hours of heat retention. Versatile warming for the body: provides soothing warmth from hands to feet, and from neck to waist and back. Helps relax muscles and supports a cozy, comfortable sleep. Safe and convenient to use: widemouth and funneltype inlet design reduces the risk of scalding and makes water filling easier and more user friendly. Easy cleaning and long service life: disassembly allows easy cleaning with both hands, enabling regular maintenance and prolonging dailyuse reliability. Use scenarios Cold mornings: wrap warmth around hands and feet to start the day comfortably. Postexercise relief: ease tension in the neck, shoulders, and back after activity. Presleep comfort: warm the bed area for a more relaxed, restful night. Key attributes Material: rubber water bottle Inlet design: widemouth with funneltype fill interface Fill guidance: use twothirds of 80degree water Maintenance: easy disassembly for cleaning and hygiene Performance: designed for longlasting heat retention and safe, convenient operation