Electricity-Free Foot Warmer: The large hot water bottle has a 2L capacity which can store and release heat for a long time. Inside the heating hot water bottle is a soft and fluffy lining that wraps your feet warm in the cold season. Soft and warm This microwave hot water bottle comes with 1 detachable plush liner , very comfortable and soft to the touch. Made of high quality thickened polyester, very fluffy and warm. Heated liner has a heel design, which does not let the wind through, which makes it warmer (machine washable plush cover). Anti-scalding design The inner bladder warms the feet Adopts diagonal stripe design to reduce contact area and ensure comfortable temperature. The slipper can also be used alone as a hot water bottle. Note: It is best to pour hot water that does not exceed 80 degrees. Safe and easy to use: Our foot hot water bottle is made of anti-aging natural rubber, which is completely waterproof and designed for explosion-proof. Wide mouth for easy filling, screw cap and anti-splash lip to prevent leaks and spills. Note: It is best to pour hot water that does not exceed 80 degrees. Perfect choice: Feet warmer is ideal for warming feet in winter, and electric foot warmer is easy to use and pampers your feet with soothing warmth. It is a good choice for Christmas, Mother's Day, Father's Day and birthday gifts for friends and family.