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