Genuine U.S. Army Airborne Vietnam War era P64 Paratroopers liner for the M1 helmet. The liner is in good condition and was made by Marmac/Firestone, DSA (Defense Supply Agency) contract number & date to the suspension webbing and was made in 1967, has two female snap fasteners one on each side that connects with the male snap fasteners on a M1 helmet chin strap, liner comes with a genuine U.S. Vietnam War era chin strap that connects to the A straps, and comes supplied with a genuine U.S. sweatband/headband with DSA contract markings and is dated 1977.