Our specially developed rib-knit crew socks are made by Pantheralla, an English mill that makes some of the best socks in the world. They have lots of stretch, are made of superfine merino wool blended with a touch of nylon for strength. Machine-washable. Line dry for best results. Sizes M , L and XL. (See "More Details" tab for chart to fit by your men's shoe size.) Black, navy, dark brown, grey, wine or dark blue.