Personalized Chemical Eggineer Youth Long Sleeve T-Shirt. Eggineers are engineering eggheads and this humorous egghead with safety glasses and beaker of chemicals and the text chemical eggineer, is a fun gift design for 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)