Show off your gearhead humor with this black t-shirt. The tee features a complex gear shift pattern for a multi-speed truck, along with the phrases, "WHAT PART OF" at the top and "DON'T YOU UNDERSTAND?" at the bottom. This shirt is perfect for truckers, mechanics, or anyone who appreciates a good laugh. The design is printed in white. Made from comfortable materials. Great for casual wear or as a fun gift for the truck enthusiast in your life. This clever tee is sure to turn heads and spark conversations.