4.2 oz./yd2, 100% Airlume pre-shrunk combed and ringspun cotton, 32 singles. Athletic Heather is 90/10 airlume combed and ringspun cotton/polyester. Alternate Heather colors are 52/48 airlume combed and ringspun cotton/poly. Retail fit. Unisex sizing. Shoulder-to-shoulder taping. Side seams. Made in the USA with imported fabric. Tear away label.