Personalized Coolest Mechanical Engineer Toddler T-Shirt. The world's coolest mechanical engineer text with a snowman holding a gear and sporting a hat and scarf with gears is a humorous engineering gift design for birthdays and holidays. 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.