Personalized Pi Day Party Funny Math Men's V-Neck T-Shirt. Funny math design has Pi Day symbol in a slice of pie on this humorous math lover Men's V-Neck T-Shirt - Black. 4.7 oz., 100% pre-shrunk cotton Narrow, set-in 1x1 mitered V-neck collar Shoulder-to-shoulder taping Double-needle stitched sleeves and bottom hem