These socks are made using a proprietary blend of yarns specially sourced by Tribe Socks. They are 200 needle knit crew made from 58% Recycled Polyester 22% Nylon 15% Cotton and 5% Elastane. They are a true one size fits most, and are available up to size 12 Men's (U.S.). These socks have an unprecedented amount of stretch with durable print quality.