Personalized Nuclear Engineer Line T-Shirt. Nuclear engineer with a decorative line sporting a radioactive symbol is a unique gift design for engineers and students at back to school, birthdays,holidays and graduation. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.