Sport socks with electric heating system are very helpful to keep your feet warm in winter. With rechargeable batteries, it is convenient to wear these socks. Also, you can contorl your own temperature. Features: Made from fine fabric, comfortable to wear. Electric heating, convenient to keep your feet warm. Comes with batteries or without batteries, choose your own style. Perfect for winter outdoor activities, such as skiing, hiking, snowboarding. Specifications: Size: One Size Color: Black1 / Black2 / Grey1 / Grey2 (optional) Without Batteries: 1# With Batteries: 2# Gender: Unisex Age Group: Adult Material: 100% Cotton Hose Height: Stockings Pattern Type: Solid, Patchwork Style: Sporty Weight: Approx. 150-300g / 5.3-10.6oz Note: 1.This clothing size information is just for reference only, please allow 1-2cm (0.4-0.8") differences due to manual measurement, thanks. 2.Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same. Package List: 1 * Pair of Socks