Eat Sleep Calculus Math Student Teacher Nerd Geek 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 Available in Men's Women's & Youth Sizes and multiple Colors great shirt for Honor Student, High G.P.A, College, High School, middle school, Mathematics major and more! Lightweight, Classic fit, Double-needle sleeve and bottom hem