Rottweiler on Natural Ultra Lightweight Cotton Crew Socks One Size Fits Most Cotton Blend Lightweight Stretch Cotton, No Shrinkage Problem Single Pair, One Size Fits Most (Womens 9-11) Lightweight Stretch Cotton are great form fitting socks Each pair are made with high quality soft cotton and have great stretching power wash after wash. Cotton is widely preferred for softness. Nylon is used for strength and spandex is great for stretching power.