Personalized Don't You Have More Important Things To Do black Long Sleeve T-Shirt. Don't You Have More Important Things To Do black Long Sleeve T-Shirt - Red, featuring George, the sassy penguin from "Bob is a Unicorn" by Michelle Nelson-Schmidt. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL