Warmawear Battery Heated Socks with Dual Fuel Pocket and Remote Control Easy-to-use remote control keychain - turn on/off, or switch between three heat settings Advanced carbon ceramic infrared heating element distributes heat gently and evenly Dual Fuel Technology allows you to have back up heat, extend the heating life of your socks and maximise the sock warmth by combining our disposable heat packs with the battery heating Discreet battery boxes with adjustable leg straps and flexible cables can be positioned over ski boots or wellies Convenient on/off switch located on battery box - no need to remove the batteries to switch it on or off