Personalized Math Rocks Toddler Full Zip Hooded Jacket. Math rocks with three happy rocks dancing with numbers is a humorous design for mathematicians, students and teachers at birthdays, holidays, back to school and graduation. 7.5 oz., 60/40 cotton/polyester. Jersey-lined double-needle hemmed hood. Pouch pockets for all their treasures. Coverstitched shoulders and armholes. Coverstitched rib waistband and cuffs.