Personalized Boys Math Dark Products Long Sleeve T-Shirt. Boys rock at math in blue and red text is a fun design for students and teachers to promote enthusiasm for mathematics. Unique gift design for birthdays, holidays, back to school and graduation. 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