4.5 oz./yd², 100% ring-spun USA cotton; Heather Grey is 90/10 ring-spun cotton/polyester; Reactive-dyed for longer lasting color; Pre-washed to minimize shrinkage; Ribbed binding on neckline and armholes; Double-needle neck and bottom hem; Tear away label; USMCA certified; This product meets the following Sustainable Style subcategories:Sustainable Manufacturing: This product meets the OEKO-TEX Standard 100Socially Conscious Manufacturing: This product was made in a facility that holds a SMETA audit certification; ;