Funny Math T-shirt - Binary: It's as Easy as 01, 10, 11 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 Great gift idea or Tee for mathematicians or any interested binary mathematics / math / algebra / calculus Lightweight, Classic fit, Double-needle sleeve and bottom hem