4.2 oz./yd, 100% Airlume combed and ring-spun cotton, 32 singles. Athletic Heather is 90/10 Airlume combed and ring-spun cotton/polyester . Heathers are 52/48 Airlume combed and ring-spun cotton/polyester. Pre-shrunk. Retail fit. Unisex sizing. Ribbed cuff. 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.