Personalized Math Wiz Youth Long Sleeve T-Shirt. Math Wiz text with a heart dotting the letter i in the word wiz is a fun gift design for mathematicians, teachers and students at back to school, birthdays, holidays and graduations. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)