We have carried a variety of alpaca socks and these are a crowd favorite! The crew socks are 70% Alpaca, 28% Nylon and 2% Lycra Spandex. They are warm, durable and offer superior wicking for odor and dampness over wool. They are machine washable cold, lay flat to dry. They come in Tobacco Brown, Steel Gray, and Black. Medium: Women's 6-9 Men's 6 - 8.5 Large: Women's 9.5 - 12 Men's 9 - 12 Extra Large Men's 13 - 16