Personalized Math Smile Long Sleeve T-Shirt. A smiling face made from math text with the caption, makes me smile is a humorous gift design for mathematicians, math students and teachers at back to school, graduation, birthdays and holidays. 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