6 oz./yd² (US) 10 oz./L yd (CA), 100% U.S. cotton, 18 singles Ash Grey is 99/1 cotton/polyester Heather Colors & Safety Colors are 50/50 cotton/polyester Antique Colors & Sport Grey are 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 Classic width rib collar Taped neck and shoulders Tear away label PFD White: 100% cotton with cotton thread No optical brighteners - allows for more consistent dye adherence. Increased body and sleeve lengths to accommodate  shrinkage. Responsible Supplier:  this product was made in a facility that is OEKO-TEX and FLA certified. Responsible Materials:  contains US grown BCI cotton