The Military Modular Sleeping Bag is constructed to insulate the user in environments ranging from mild weather to extremely cold weather. The Military Modular Sleeping Bag 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 Military Sleeping Bag is fully functional, independently. For a temperature to -30degrees, insert the Intermediate Cold Weather bag inside the Patrol bag. Each bag is compatible with the vapor permeable bivy cover. When all three compartments of the Gor-tex three-part sleeping bag are used together, the system is rated to provide four hours sleep at -40 degrees. A compression stuff sack is included and detailed below. Non-flammable and machine washable. PATROL BAG FEATURES: Temperature to +30degrees, reversible double-pull (opens end to end) slider allows top or bottom ventilation, non-locking slide fastener self repairs if jammed or snagged, draft flap prevents heat loss, hood adjusts for heat retention. Includes nylon drawcord and barrel lock. Measures 92" x 37" to 92" x 24". Color: Green. Order your Military Modular Sleeping Bag today. INTERMEDIATE COLD WEATHER BAG FEATURES: Temperature to -10 degrees from cold spots, insulation does not migrate in the bag. Anatomically designed foot box contains twice the insulation as the bag, sewn-in; quilted chest collar prevents air drafts up and down through the hood; hood adjusts for heat retention. Includes nylon drawcord and barrel lock. Measures 87" x 35 1/2" to 87" x 23". Color: Black. Bivy Cover. STUFF SACK FEATURES: Compressible to one cubic foot, six 1" wide nylon webbing straps by ladder lock buckles, reinforcement webbing is sewn around the circumference of the bag, nylon drawcord closure with a barrel lock. Measures 30" in length, 14" diameter. Color: Foliage. The GOR-TEX outside shell is Army Digital Camouflage. Order your Military Modular Sleep System today.