Personalized Petroleum Engineer (Worlds Best) T-Shirt. Petroleum Engineer T-Shirt - Red engineering job shirt has a white and blue worlds best logo, a nice present for a thank you appreciation gift. 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.