Personalized Coolest Chemical Engineer Youth T-Shirt. A hard hat topped snowman, holding a beaker and The world's coolest chemical engineer text is a funny design for birthdays and 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.