These men's Polar Extreme thermal calf length socks are the best helping you keep you feet warm and comfortable in all types of cold weather. The fiber contents help wick moisture away from your feet keeping them nice and dry. The woven pattern material helps maintain sock shape and elasticity so sock sty up and not ride down. Soft brushed lining adds an extra layer of comfort to help reduce itch you get from most other insulated socks. Fits shoe sizes 6-12 and sock sizes 10-13. Polar Extreme socks: Machine wash cold, tumble dry low. 95% Acrylic, 1% Spandex, 4% Other Fiber. These socks are so soft and warm you will want to buy more than 1 pair and you will love even wearing these around the house for incredible comfort!