Irish American 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 Patriotic USA America Flag Shirts for men,women and kids. Irish American Flag Shamrock green t shirts Lightweight, Classic fit, Double-needle sleeve and bottom hem