Personalized Pi Day Math Symbol Celebration Party Men's V-Neck T-Shirt. Celebrate Pi Day with a Men's V-Neck T-Shirt - White featuring distressed look math symbol logo for students, engineers or a math teacher. 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