4.2 oz./yd, 52/48 airlume combed and ring-spun cotton/polyester, 32 singles. Athletic Heather & Black Heather are 90/10 airlume combed and ring-spun cotton/polyester. Pre-shrunk. Retail fit. Ribbed cuffs. Side seams. Tear away label. This product meets the following Sustainable Style subcategory - Socially Conscious Manufacturing - This product was made in a facility that partnered with or is accredited by the Fair Labor Association and made in a facility that is WRAP and bluesign certified.