4.5 oz./yd², 100% ring-spun USA premium cotton, 30 singlesHeather Grey is 90/10 ring-spun cotton/polyesterOther Heathers are 50/50 ring-spun cotton/polyesterReactive-dyed for longer lasting colorPre-washed to minimize shrinkageContrast ribbed binding on neckline and sleevesTaped neck and shouldersDouble-needle stitching on neck and bottom hemTear away labelUSMCA certifiedThis 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