Personalized Environmental Genius Youth T-Shirt. Environmental Engineering, the profession for intelligent people with the letter E in engineering wearing a hard hat is a humorous engineering gift design for college students and engineers at back to school, birthdays, holidays and graduation. 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.