These Polar Extreme insulated thermal socks are the best helping you keep your feet warm and comfortable in all types of cold weather. The fiber content helps keep moisture away from your feet keeping them nice and dry. The woven pattern material helps maintain sock shape and elasticity so sock stays up and not ride down. Soft brushed lining adds an extra layer of comfort to help reduce itch you get from most other thermal socks. Fits shoe sizes 5-9 and sock size 9-11. Machine wash cold, tumble dry low. 95% Acrylic, 1% Spandex, 4% Other Fiber. A great sock for the cold weather out doors type of gal. These socks are so soft and warm you will want to have more than 1 pair and you will love even wearing these around the house for incredible comfort!Warmth – The yarns we use have excellent thermal properties and when combined with the specialized manufacturing techniques we employ, the result is the warmest thermal sock imaginable.