Although it is unclear how this item originated, it was first fielded around 1962 to special forces troops in Vietnam. The poncho liner consists of two layers of quilted nylon encasing a polyester batting. There were tie-cords on the corners and side that could be tied through matching grommets on rain ponchos. They measured 62 x 82 inches. The intent was to field an item which was lighter and faster drying than the standard-issue Army Wool Blanket, which had essentially been rendered obsolete in the wet and tropical environment of Vietnam.