Bella Canvas Unisex Jersey 3/4 Sleeve Baseball Tee 52% combed and ring-spun cotton 48% poly Triblends are 3.8 oz., 50/25/25 polyester/airlume combed and ringspun cotton/rayon, 40 singles. Black Heather is 90/10 airlume combed and cotton ringspun cotton/polyester. Marbles are 4.0 oz., 91/9 polyester/airlume combed and ringspun cotton, 32 singles. All other colors are 3.6 oz., 52/48 airlume combed and ringspun cotton/polyester, 40 singles.