Show off your confidence with this bold, black graphic t-shirt. Made from a soft, comfortable fabric, this men's tee features the statement "I Know Self Defense, So Back Up" in a crisp white font across the chest. The classic crew neck and short sleeve design make it perfect for casual wear. This shirt is ideal for those who appreciate humor and want to make a statement. Wear it to the gym, while running errands, or just lounging at home. Make it clear you're not to be messed with while rocking style!