Bella Canvas 8803 - Flowy Muscle Tank 100% Polyester 3.7 oz., 65/35 polyester/viscose, 32 singles. Athletic Heather is 52/48 polyester/viscose. Black Heather is 80/20 viscose/polyester. Marbles are 3.5 oz., 91/9 polyester/airlume combed and ringspun cotton, 40 singles.