NSN # 8465-01-445-6274. This system is constructed to insulate the user in environments ranging from mild weather to extremely cold weather. The system consists of two Mummy-style sleeping bags–the Patrol (Green) and the Intermediate Cold Weather (Black). Each are constructed of water-resistant, ripstop nylon. Each sleeping bag is fully functional independently. For a temperature to -30°, insert the Intermediate Cold Weather bag inside the Patrol bag. Each bag is compatible with the vapor permeable bivy cover (MIL-C-44307). When all 3 components are used together the system is rated to provide 4 hours sleep at -40°F. A compression stuff sack is included and detailed below. Non-flammable and machine washable. This item is used military surplus, excellent condition and is sold as-is, final sale. Color shades may vary. Note: Does not include Bivy cover.