Maryland State Police Maryland State Trooper Baltimore 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 This thin blue line police support theme makes a great police academy graduation gift. This shirt has a thin blue line flag and makes a good police retirement shirt gift. Lightweight, Classic fit, Double-needle sleeve and bottom hem