Personalized Math Wave Long Sleeve T-Shirt. Math in colorful 3D Letters forming a wavy line is a unique gift design for teachers and students at back to school, birthdays, holidays 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