Personalized What If It's the Best Summer Yet? Long Sleeve T-Shirt. Make every summer the "best summer" with What If It's the Best Summer Yet? Long Sleeve T-Shirt - Athletic Heather, featuring Jonathan James from "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