Rib collar. Antique colors & Sport Grey are 90/10 cotton/polyester. Ash Grey is 99/1 cotton/polyester. Safety Green is compliant with ANSI / ISEA 107 high-visibility standards. Classic fit. Made with 100% U.S. cotton and the latest breakthrough in soft cotton technology, the Gildan® Heavy Cotton family has been remastered for improved printability, quality and comfort you can see and feel.