Our other T-shirts are Gildan 100% Heavyweight Pre-Shrunk Cotton. Designs are screen printed directly onto the shirts (Keep on Truckin', Mr. Natural, and Work On It) using 7 to 8 colors. Unlike our competitors' shirts, they are not transfers! The three other designs (Genesis, Twas Ever Thus and Head Comix) are digitally printed directly onto the shirts creating even more than 8 colors. This is the highest quality and most expensive printing method, not to be confused with transfers. Your complete satisfaction guaranteed, or your money back!