MARINE CORPS ISSUE FROG THERMAL SHIRT. FLAME RESISTANT ORGANIZATIONAL GEAR. SHIRTS ARE PART OF THE U.S MILITARY EXTREME COLD WEATHER GEAR. BASE LATER SHIRT TO BE WORN NEXT TO SKIN FOR COMFORT AND MOISTURE WICKING. 78% MODACRYLIC 22% FR RAYON ANTIMICOBIAL MATERIAL. SIZE IS A MEN'S LARGE MEASUREMENTS ARE ARM PIT TO ARM PIT IS 21 1/2" INCHES. TOP OF COLLAR IN FRONT TO BOTTOM HEM IS 28" INCHES. SHOULDER TO SLEEVE CUFF END IS 24" INCHES. SHOULDER TO SHOULDER IN BACK IS 20 " INCHES. MFG BY XGO PECKHAM FOR THE U.S MILITARY. ALL SHIRTS ARE NEW.