Antique colors & Sport Grey: 90% ring spun cotton, 10% polyester Graphite Heather is 50% ring spun cotton, 50% polyester Heather colors & Blackberry: 65% polyester, 35% ring spun cotton The color "Natural" is made with unprocessed, unbleached cotton, which results in small black flecks and plant fibers throughout the fabric. Modern Classic Fit 5/8" rib collar