High quality, safe and durable: no electricity foot warmer is made of high-quality natural rubber, very safe and durable and easy to clean. Our foot heater complies with the British safety standard BS1970:2012. The larger opening provides better protection when pouring and the lid does not leak when screwed on. Soft and warm: this foot warmer mat comes with 1 removable plush lining, which feels very comfortable and soft. Made of thickened high-quality polyester material, very fluffy and warm. Cold feet warm has a heel design that does not let the wind through and makes it warmer (plush cover machine washable). Large capacityThe warm feet capacity is 2L, which can store and release heat for a long time. Jacket size: 36 x 30 cm, hot water bottle foot warmer fits shoe size 44-46, suitable for most adults. (Note: fill it with 2/3 of the water, not too full.) Anti-scalding design: heated slippers inner bubble uses a diagonal stripe design to reduce the contact surface and ensure a comfortable temperature. The inner tank can also be used alone as a hot water bottle with cover. Note: It is best to pour hot water that does not exceed 80 degrees. Ideal for winter: feet warmer is ideal for warming your feet in winter. It will always keep your feet warm on cold winter nights. Winter/Birthday/Christmas/New Year gift for family and friends.