4.5 oz./yd, pre-shrunk 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. Ribbed crewneck collar. Back neck tape. Shoulder-to-shoulder taping. Side seams for size 4XL. Double-needle stitching on bottom hem. 1x1 ribbed cuffs. 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.