6 oz./yd², 100% ring-spun cotton, 20 singles Graphite Heather is 50/50 cotton/polyester Sport Grey is 90/10 cotton/black polyester Made with our soft ring spun cotton, Hammer's high stitch density fabric provides a heavier weight, smooth printing surface Modern classic fit Classic width, rib collar Taped neck and shoulders for comfort and durability Rib cuffs Side seams Tear away label Responsible Supplier:  this product was made in a facility that is OEKO-TEX and FLA certified. Responsible Materials:  contains US grown BCI cotton