Personalized Happy Pi Day Pink Math Symbol Toddler Full Zip Hooded Jacket. Cute pink pi math symbol with stitch border on a Toddler Full Zip Hooded Jacket - Black with Happy Pi Day quote. 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.