Our electric heated socks battery powered heating socks with long working hours and cozy temperature can keep your feet warm and comfortable all day long,great fit for any indoor outdoor activities: especially perfect for climbing, hiking, hunting, ice-fishing. Feature - Color: Black. - Material: Cotton. - Size: 41.00X10.50X1.00cm/16.11X4.13X0.39 inch. - Heating temperature: Approx.50 degree centigrade. - Voltage of battery box: 4.5V. - Very safe: safe temperature, far infrared heat, only 4.5V. - Higher temperature, more comfortable experience: Upgrade to 4.5V on the basis of the original 3V, need to put 3 batteries, the temperature is higher, it is more comfortable to wear in the cold winter, keep warm. - Battery box with light design: open and closed with clear instructions, and if the battery is not powered, you can intuitively see if the electric stockings are working, it is easier to distinguish in the dark. - experience: meticulous workmanship, fine the side of the car, socks are stronger and more durable. - Heating area: It is the easiest to feel the cold back of the toe, heating and keeping warm, the socks are elastic, and can be stretched to meet different size requirements. Package list: 1 pair 2 x battery boxes