6 oz./yd² (US) 10.1 oz./L yd (CA), 100% cotton, 18 singles; Ash Grey is 99/1 cotton/polyester; Dark Heather & Safety Colors are 50/50 cotton/polyester; Sport Grey is 90/10 cotton/polyester; Safety Green is compliant with ANSI/ISEA 107 high-visibility standards; Innovation you can feel. Made with 100% U.S. cotton and the latest breakthrough in soft cotton technology, the Gildan® Ultra Cotton family has been remastered for improved printability, quality and comfort you can see and feel.; Classic fit; Rib collar ; Taped neck and shoulders for comfort and durability; Rib cuffs; Tear away label; Proud member of the U.S. Cotton Trust Protocol; Made with OEKO-TEX certified low-impact dyes; This product meets the following Sustainable Style subcategories:Sustainable Manufacturing: This product meets the OEKO-TEX Standard 100.Socially Conscious Manufacturing: This product was made by a mill who partnered with Fair Labor Association and was made in a facility that is WRAP certified.