Personalized Heart Elements Toddler Full Zip Hooded Jacket. A heart filled with Chemical Elements and their symbols is a unique chemistry design for students, teachers, chemists and chemical engineers. 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.