Personalized Pi Day Party Funny Math Toddler Full Zip Hooded Jacket. Funny math design has Pi Day symbol in a slice of pie on this humorous math lover Toddler Full Zip Hooded Jacket - Black. 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.