Stock up on 100% cotton blend custom muscle shirts for your school store or fundraisers. These sleeveless shirts will make a unique addition to the standard T-shirts and sweatshirts in your school store. Muscle Shirt price shown includes a one-color screened imprint. Additional colors, locations, embroidery, and personalization are also available for this muscle shirt. NOTE: Heather gray shirt is 90% cotton/10% poly.