Personalized Math Genius Frog Toddler T-Shirt. A happy green frog holding a banner that reads Math Genius is a humorous gift design for mathematicians, math school teachers and students. A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.