Math Teacher Took the Rhombus Funny T-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 Why was the math teacher late? He took the rhombus. This shirt is the perfect end of the school year gift for your favorite math teacher. Lightweight, Classic fit, Double-needle sleeve and bottom hem