One of the finest hosiery manufacturers in the world, Patherella of England, makes our knee-length rib-knit socks with lots of stretch for comfort. They use superfine merino wool blended with a touch of nylon for strength and durability. 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 or grey.