Personalized Kids Proof That Math Teachers Multiply Funny Toddler Full Zip Hooded Jacket. funny math teacher themed baby slogan says Im proof that math teachers multiply 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.