Personalized Math Tribe Cute School Long Sleeve T-Shirt. This fun back to school math design has lion and Pi math symbols with math tribe quote. 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