Personalized Mechanical Engineering Genius Toddler Full Zip Hooded Jacket. Mechanical engineering genius text with a line of gears is a unique gift design with attitude for engineers and students at back to school, birthdays, holiday 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.