Personalized Wavy Math Counts Youth T-Shirt. Math in wavy text and the only subject that counts in black and red is a humorous math design with a double meaning is a fun design for mathematicians, students and teachers. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.