Personalized Biology Teacher Gift Appreciation Women's V-Neck T-Shirt. Biology Teacher Women's V-Neck T-Shirt - Kelly Green gift has a great sports look logo that says Worlds Best Bio Teacher. 5.0 oz., 100% pre-shrunk cotton Athletic Heather is 90/10 cotton/polyester 1x1 rib collar with mitered v-neck Shoulder-to-shoulder taping Ladies' fit