Personalized Coolest Mining Engineer Toddler T-Shirt. A snowman holding a shovel and The world's coolest mining engineer text is a humorous gift design for college students and engineers on birthdays and winter 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.