5.3 oz./yd² (US) 8.8 oz./L yd (CA), 100% cotton, 20 singles; Sport Grey is 90/10 cotton/polyester; Innovation you can feel. 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.; Classic fit; Rib collar ; Taped neck and shoulders for comfort and durability; Rib cuffs; Side seams; Tear away label; CPSIA Tracking Label Compliant; 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.