Winter Heating Socks Electric Heated Socks Cold Weather Heated Cotton Socks with Constant Temperature for Men Women Outdoor Riding Camping Hiking Fishing Skiing A carbon fiber heating sheet at the bottom of foot heats your socks when you turn on the power, 50°C constant temperature, can keep your feet warm during ice fishing, hiking, skiing and working outdoors in winter. Features: Made of thick cotton, soft and breathable with proper elasticity. Built-in a carbon fiber heating sheet, heating from the sole quickly and evenly. 50°C constant temperature keep you warm all day long. One Size fits all. Long tube cotton socks can cover the calf, widely matched, warm and stylish. Best companion for cold indoor & outdoor activities like lounging, ice fishing, camping, snowboarding and working. Note: The temperature of socks without battery are constant, approx.50°C. Just connect the socks to your power bank with the transferred wire provided. Specifications: Material: Cotton Color: Black with battery / Grey with battery / Black without battery / Grey without battery (optional) Suggested feet size(CN): 35-44 Product Weight: 99.2 g / 3.5 oz Package Size: 16 * 8 * 8 cm / 6.3 * 3.1 * 3.1 in Package List: 1 * Pair of Socks 2 * Transfer Wires Power bank is Not included.