1. Practicality: The temperature of the hot water bottle can be maintained for at least 3 hours at room temperature. Put it on the bed for ten minutes and the bed will warm up. Put it in a quilt and its temperature can be preserved. Let the hot water bottle warm up your winter. 2. Hot water bottle parameters: length 72 cm (28.35 inches) width 12 cm (4.72 inches)Nice gradient color 3. Our hot water bottle material: inner liner 2L pure natural rubber, anti-aging, long-lasting heat preservation, knitted jacket can effectively share the most comfortable temperature with you. 4. Multi-scene use: It can be used to warm hands, neck, waist, back, etc. After you put the hot water bottle in the bed before going to bed, it can provide you with a warm bed. It's also a perfect gift 5. Energy saving : environmental protection and safety, hot water bottled water, no leakage.