Irish Colorado Flag Shamrock 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 Popular St Patrick's Day T Shirts for men,women and kids. Vintage Irish Flag of Colorado T Shirt.Popular Colorado Flag tees. Lightweight, Classic fit, Double-needle sleeve and bottom hem