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, DSA (Defense Supply Agency) contract number & date to the suspension webbing and was made in 1970, 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.