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Pi Day Shirt Teachers Love Pi Math Geek Gift Womens Mens Hentai May 2006 13th Birthday GiftsPi Day Shirts For Men, Women, And Kids Are The Perfect Funny Math Shirt Gift For That Math Geek In Your Life. A Pi Shirt Is A Great Math Shirt Present For Someones Birthday, Christmas, Or Happy Pi Day. Lightweight, Classic Fit, Double Needle Sleeve And Bottom Hem 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