5.5 oz./yd², 100% ring-spun USA premium cotton, 24 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 shrinkageRibbed crewneck collarTaped neck and shouldersDouble-needle stitching on bottom hemRibbed cuffsTear away labelUSMCA certifiedThis 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