Bella + Canvas Womens Slouchy T-Shirt (8816)- Dark Grey Heather,Medium 3.7 oz., 65% polyester, 35% viscose 30 singles Athletic Heather is 52% polyester, 48% viscose Triblends - 50% poly, 25% combed ringspun cotton, 25% rayon, 40 singles, 3.8 oz. Marble colors are 91% poly, 9% combed ringspun cotton, 40 singles, 3.5 oz.