There Is A Fine Line Between Numerator And Denominator 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 There Is A Fine Line Between Numerator And Denominator Only A Fraction Will Understand Shirt I know math is difficult but some people actually love it. Whether you enjoy calculations and doing math problems or not, this shirt will make you smile. Lightweight, Classic fit, Double-needle sleeve and bottom hem