Personalized Environmental Genius Youth Long Sleeve 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. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)