Personalized White Math Smile Long Sleeve T-Shirt. A math smile with the smiling face composed of the word math is a funny gift design for mathematics students and teachers. 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