Casual Crew sock, is a light, breathable, soft fiber blend that are extremely long-wearing and supportive but not restrictive. These socks are incredibly easy to care for and due to their antimicrobial properties, feel free to wear them a few times before washing. But when they do need to be cleaned, simply machine wash warm, then toss them in the dryer. 33% American bison down / 33% Merino wool / 33% Bamboo Made in USA