4.5 oz./yd², 100% ring-spun USA cotton, 30 singles; Heather Grey is 90/10 ring-spun cotton/polyester; Other Heathers are 50/50 ring-spun cotton/polyester; Reactive-dyed for longer lasting color; Pre-washed to minimize shrinkage; Contrast ribbed binding on neckline and sleeves; Taped neck and shoulders; Double-needle stitching on neck and bottom hem; Tear away label; USMCA certified; This product meets the following Sustainable Style subcategories:Sustainable Manufacturing: This brand is working towards an OEKO-TEX Standard 100 certificationSocially Conscious Manufacturing: This product was made in a facility that holds a SMETA audit certification