Aliens Built the Egyptian Pyramids 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 This "true story" about ancient history will amuse and/or puzzle. Great gift for anyone looking for a funny science shirt. Works for anyone interested in reason, science, evolution, darwinism, natural selection, pro-science, or astronauts. Lightweight, Classic fit, Double-needle sleeve and bottom hem