Wool has always been the first choice for socks and Superwash Merino, with fine long-staple fibers, is the best available. This sock is a casual sock for day-to-day comfort, 96% Superwash Merino wool, 4% nylon for heel and toe reinforcement. It is firmly knit, with a smooth foot and ribbed leg. Sock length is 10 inches. Machine wash, tumble dry. Made in Canada.