4.5 oz./yd², pre-shrunk 100% ring-spun USA premium cotton, 30 singles Heather Grey is 90/10 ring-spun cotton/polyester Other Heathers are 50/50 ring-spun cotton/polyester Classic fit, contoured silhouette Reactive-dyed for longer lasting color Ribbed crewneck collar Back neck tape Side seams Double-needle stitching on sleeves 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 100 Socially Conscious Manufacturing: This product was made in a facility that holds a SMETA audit certification