ACU Digital Bivy Cover ACU Digital Camouflage 100 percent water/wind proof outer layer. Designed to enclose patrol and intermediate cold weather sleeping bag for the complete modular sleep system. Nonflammable, machine washable. 2 way nylon zipper that allows for top or bottom ventilation (the zippers are non locking sliders which self repairs if jammed or snagged). Can be used alone for warmer temperatures. Approximately 80" x 30"