Personalized Biological Engineer Leaf Long Sleeve T-Shirt. Biological Engineer text on a white leaf is a unique engineering design. Fun gifts for bioengineers and college students at back to school, birthdays, holidays and graduation. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL