4.5 oz./yd², 60/40 combed ring-spun cotton/polyester; Black Reptile, Natural Heather, Saltwater, and Sunset are 100% combed ring-spun cotton; Heather is 90/10 combed ring-spun cotton/polyester; Ribbed collar; Self-fabric back neck tape; Double-needle sleeves and bottom hem; EasyTear™ label; This product meets the following Sustainable Style subcategory:Socially Conscious Manufacturing: This product was made in a facility that is WRAP certified