Official US Army MultiCam FR Combat Long Sleeve Shirt by Massif - Sz. Extra-Large Meets the strenuous manufacturing and performance testing requirements of the Armys Team Soldier Certified authorization program: PEO Soldier Certification Program Passes rigorous flame testing including the ASTM D 6413/F2302-03 for vertical flame resistance. Tested in flash fire simulations on the pyroman thermal mannikin to demonstrate performance in burn scenarios Over one million shirts fielded by the U.S. Army.