Vintage Union Jack Flag 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 Also known as the Canadian Royal Union Flag, the Union Jack or Union Flag is the national flag of the United Kingdom. Lightweight, Classic fit, Double-needle sleeve and bottom hem