Personalized Pi Math Day grunge Long Sleeve T-Shirt. Pi Math Symbol Long Sleeve T-Shirt - Black has fun grunge look. graphic licensed from and c. www.graphicsfactory.com 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