Personalized Biological Engineer Line T-Shirt. Biological engineer with a decorative line sporting an ant. A fun gift design for college students, research assistants and biological engineers 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.