Personalized Pi Day Math Symbol Celebration Party Long Sleeve T-Shirt. Celebrate Pi Day with a Long Sleeve T-Shirt - White featuring distressed look math symbol logo for students, engineers or a math teacher. 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