In the past she has used Hanes Beefy Tee.......very good shirt. I know the shirt will be 100% cotton. I can check with her this evening to see if that is what she intends to use and get back. The print is a double print meaning she put down the print, does a "flash dry", prints over it again, then does a final heat set. This produces a very durable print. She only uses quality materials and is very picky about her end product.