Personalized Traffic Eggineer Youth Long Sleeve T-Shirt. Eggineers are engineering eggheads and this humorous egghead with a traffic light, a hard hat sporting a road and directional text will bring a smile to your engineer on 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)