Mens/Unisex shirts are printed on American Apparel 2001 or Bella Canvas 3001  and Ladies shirts are printed on Bella "Favorite Tee" 6004, all of Ring-Spun Super Soft Jersey Knit. 3XL and 4XL may be substituted with Gildan or Hanes in closest color match. Not sure what size you need? We have Always order up a size if in doubt.