100% cotton blend muscle shirt comes with your choice of one of our stock designs! It's super easy. Choose your stock design, choose your shirt color, and one imprint color. In no time at all, you will have the perfect shirts to stock your school store or sell as Spirit Week fundraisers. Muscle shirts with stock designs like these are one-of-a-kind and budget friendly! NOTE: Heather gray shirt is 90% cotton/10% poly.