Women"s original universal wool socks, size 9-11, are thin enough for everyday wear in your shoes, yet thick enough for your boots. It is made of 50% merino and lambs wool, 28% stretch nylon, 20% polypropylene (for wicking away moisture) and 2% spandex. This sock is superwash treated which is a chemical process applied to the socks after the initial wash at the plant to prevent shrinkage despite numerous washing and drying. This product is also available in other colors. Made in Canada.