Installing Muscles Please Wait T-Shirt Where can I find other installing muscles please wait designs? Expand or collapse section. In addition to installing muscles please wait designs, you can explore the marketplace for workout, fitness, and gym designs sold by independent artists. What material is this item made of? Expand or collapse section. 100% combed ringspun cotton. The perfect fabric for a graphic tee and the softest in the business. (Due to product availability, cotton type may…