The poncho liner consists of two layers of quilted nylon encasing a polyester batting. There are tie-cords on the corners and side that can be tied through matching grommets on rain ponchos. They measure 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.