6 oz./yd², 100% ring-spun cotton, 20 singles; Graphite Heather is 50/50 cotton/polyester; Sport Grey is 90/10 cotton/black polyester; Made with our soft ring spun cotton, Hammer's high stitch density fabric provides a heavier weight, smooth printing surface; Modern classic fit; Classic width, rib collar; Taped neck and shoulders for comfort and durability; Rib cuffs; Side seams; Tear away label; Gildan partners with Better Cotton to improve cotton farming globally; 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.;