The Polar Extreme insulated thermal socks keep your feet warm and comfortable during the extremely cold winter weather. Warmth: The yarns used to create the socks have excellent thermal properties that when combined with the specialized manufacturing techniques we employ, the result is the super warmest thermal sock. Comfort: You deserve comfortable crew socks and these are them. Just feel the inside of these heavily brushed-lined socks and you can imagine how comfortable they will be on your feet. Performance: With the inherent moisture management of these socks combined with the thermal properties the result is a fantastic performing sock: the warmest thermal sock imaginable. Sizing: Fits size women 5 - 9 Sock size women 9 -11 Care: Machine wash cold with similar colors Use non-chlorine bleach when needed Tumble dry low Do not iron