These will be either Bella or Gildan brand
Bella description:
 100% airlume combed and ringspun cotton
Ash is 99% airlume combed and ringspun cotton, 1% polyester
Shoulder taping
Side-seamed
Unisex sizing
Retail fit
Pre-shrunk
Gildan brand:
 100% preshrunk ring spun cotton
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.
Double-needle stitched sleeves and bottom hem
Taped neck and shoulders
Modern Classic Fit
5/8" rib collar