Ultimate Pi Day Pi Pie Delicious Coincidence T Shirt Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Machine wash cold with like colors, dry low heat For the Ultimate Pi Day of the Century! Math fans, nerds, or people who like Pi and Pies in general, this is the Perfect Tshirt for you. This tee also makes a great gift! Hand designed with pride. Make your loved one feel special with this exclusive, unique T-Shirt. Lightweight, Classic fit, Double-needle sleeve and bottom hem