Personalized Pi Day Party Funny Math Women's V-Neck T-Shirt. Funny math design has Pi Day symbol in a slice of pie on this humorous math lover Women's V-Neck T-Shirt - Kelly Green. 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