The Polar Extreme insulated thermal socks keep your feet warm and comfortable during the extremely cold winter weather. They're great for everyday wear, hiking, camping, and any outdoor activity. Details: 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: Shoe size women 5-9 Fits sock size women 9-11 Content & Care: 94% Acrylic + 5% Polyester. Machine wash cold with similar colors Use non-chlorine bleach when needed. Tumble dry low Do not iron