Personalized Whatif I Love to Swim with Whatif Monster Long Sleeve T-Shirt. Take a dip with the Whatif Monster! Whatif I Love to Swim with Whatif Monster Long Sleeve T-Shirt - White, from the hit children's book, "Jonathan James and the Whatif Monster" 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