Klaatu Barada Nikto 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 No, we don't know what it means, either May prevent the extermination of the Earth. So, there's that Lightweight, Classic fit, Double-needle sleeve and bottom hem