Stitched from the plush winter coats of American bison, these socks are softer than cashmere and warmer than wool. Unlike common cashmere fibers that have a 19-micron diameter, these bison fibers have a 15-micron diameter, making them a finer and softer fleece. The socks also derive superior warmth from the animal’s downy undercoat and contain moisture wicking properties. With a spandex arch support, reinforced heels and toes, and flat side panels. Hypoallergenic. Machine wash, air dry. Made in the US. 64% Merino wool/17% bison down/16% nylon/2% polyester/1% spandex. Sizes S (men’s shoe 5-9, women’s 6-10) or L (men’s 9-13, women’s 10-13). Navy, Red, or Natural.