Cole Haan Men's 2 Pack Even Stripe Liner Socks, Seaport, 10-13 70% Polyester/25% Cotton/4% Spandex/1% Other Fiber Imported Machine Wash Gel tab keeps the liner from slipping in to the shoe Cotton is soft and heat-resistant. It absorbs moisture from the foot, is breathable and provides shock absorbency. Nylon is durable, shrink-resistant fiber often used in blends to add stretch and strength to socks.