Personalized Mechanical Eggineer Toddler T-Shirt. Eggineers are engineering eggheads and this egg with gears in hand and on it's hard hat with mechanical eggineer text, is a humorous design to tickle your mechanical engineer's funny bone at birthdays, holidays and graduation. A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.