4.5 oz./yd² (US) 7.5 oz./L yd (CA),100% ring-spun cotton; Sport Grey is 90/10 cotton/polyester; Dark Heather & Heather color are 65/35 polyester/cotton; Softstyle's high stitch density, soft ring-spun cotton and cotton blend fabric offers a smooth printing surface; Semi-fitted; Narrow width, rib collar; Taped neck and shoulders for comfort and durability; 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 in a facility that utilizes the Higg Index and has implemented Level 2 practices or above, was made by a mill who partnered with Fair Labor Association and was made in a facility that is WRAP certified.