Personalized Biological Engineer Patterned Text T-Shirt. Biological engineer in wave like patterned text is a unique gift design for biological scientists and engineers. 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.