The Classico has a unique retro style design. Made with Merino wool it has several unique features that separate it from others. This thin sock has a Lycra arch band to keep the sock tight over the arch to prevent sock slip motion under foot. Comparable in weight to the Wool Eator with a thin underfoot it features a high cuff made from mock rib construction to stretch over a wide variety of ankle sizes. This sock has the features to go the distance.6 Ribbed Top Cuff Care Instructions: Machine wash cold tumble-dry low no chlorine bleach. Contents:48% Wool 43% Nylon 6% Cool Max Eco-Made 3% Lycra