Bella Canvas 6400 - Relaxed Short Sleeve Jersey T-Shirt 100% combed and ring-spun cotton 4.2 oz., 100% combed and ringspun cotton, 32 singles. Athletic Heather and Black Heather are 90/10 airlume combed and ringspun cotton/polyester. Alternate Heathers are 52/48 airlume combed and ringspun cotton/polyester. Triblends are 3.8 oz., 50/25/25 polyester/airlume combed and ringspun cotton/rayon, 40 singles.