The smooth surface is designed to provide maximum heat transfer, ensuring that the bottle gets hot quickly and stays hot for a long time. The ribbed hot water bottle side is designed to diffuse heat, making the bottle more comfortable to hold and reducing the risk of burns or discomfort.

• A hot water bottle filled with hot water and sealed with a stopper.
• used to provide warmth, typically while in bed, but also for the application of heat to a specific part of the body.
• Warm/hot water is a traditional source of pain relief.
• Wrap with a cloth cover to prevent scalding the skin.
• Do not use boiling water.