4.5-ounce, 100% ring spun US cotton. 65/35 polyester/ring spun cotton (Heather Navy). Non-dyed fabric with visible specks of fibers and cotton seeds (Natural). Non-topstitched 5/8″ rib collar. Taped neck and shoulders. Modern classic fit, seamless body. Double-needle sleeves and hem. Recycled, high-performing black tear-away label.