Size Large 42-44 Details Size Large Brand Dr.Warm Color Red Material Cotton Battery Description Lithium-Ion Dr.warm Rechargeable and Washable Heated Long Socks Anyone who spends a great deal of time outside in the cold, whether for work or recreation, or who has Raynaud’s Syndrome or bad blood circulation, knows how debilitating cold feet can be. Dr.warm Washable Heated Long Socks are designed to eliminate this problem. Two 2600mAh 7.4V batteries bring you adjustable heat that lasts up to 8 hours. HOW TO USE? The Dr.warm heated socks are remote-controlled and with a large capacity of 2600mAh battery whose heating time is up to 11 hours. Just put on these heated socks and go out to have fun, and you can control them with a remote controller anytime anywhere. Here’s the instruction: Connect the battery with the wire connector, and put the battery into the battery pocket. Press the button on the sock to turn on.