Material of the foot warmer slipper: exquisite plush feeling, the fabric is thick and sturdy, the inner layer is fluffy in texture, warm and comfortable, extremely warm; the color is fresh and suitable for everyone.Easy to use: The shoes are powered by USB cable, which is very safe. Please check whether the USB port is well connected when you use it for the first time, otherwise it may affect the heat. The maximum heat temperature is 55 degrees. USB interface can be connected to computer (laptop), power bank, power adapter, car charger.Healthy: Help with heat for vessel expansion blood allowing rapid oxygen flow and better cell metabolism. Feet warm in one minute to relieve uncomfortable, tired and sore feet. A necessity for winterIdeal for soothing cold, tired or sore feet and can be applied to various occasions, such as office, dorm, home, etc.Portable and Perfect Gift: The foot warmer is USB interface, lightweight and portable, let you relax on your sofa, bed or chair in the office or at home, easy to use. Perfect festival, birthday, Christmas gift for mom, dad, friend or any other loved one.Washable Foot Warmer: There is a zipper between the shoes and the sole to place the heating chip. When cleaning, open it and remove the chip. It can be hand or machine washed. When you use it again, make sure the shoes are dry.