Personalized Coolest Engineer Youth T-Shirt. A snowman wearing a hard hat with text the world's coolest engineer is a humorous engineering design. Fun gifts for college students and engineers for birthdays and the winter holidays. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.