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Pi Day T Shirt Atom Pi Math Geek Science Lovers Gift Tshirt T-Shirt I'm With The Band T Shirt Funny Halloween Costume Tee ShirtAtom Pi T Shirt. Math Teacher Or Math Geek Birthday Gift. Perfect Outfit For Someone Who Loves Pi And Likes Science Tees. Makes A Great Gift Idea For Math Geeks, Teachers. Celebrate Pi Day March 14 In Style. 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