Ski Warm Charging Invisible Heating Socks $ 12.72 Product information: Heating Method: electric heating Color: conventional fever socks (1 pair),2200 mA batteries (1 pair),4000 mA batteries (1 pair) Material: elastan/modal core-spun yarn Applicable scenarios: health massage, sports trend, ice and snow sports Specification: average size Packing list: Socks1Pair Battery1Pair/Battery*1Pair Product Image: