Rifleman sleep System: Defence 4 sleeping bag Plus Tropen sleeping bags, 2 pcs Bivy Cover combined sleep bags in one Nylon Taslon Compression Sack. Specification: G-loft cotton, extremly warm, -20 to -40 degree cold weather resistant. Size and style: Mummy sleep bag, GM defence 4, 84.6 x 31.5inch with Middle zipper, GT Tropen, 86 x 33inch with side zipper. Shell and Liner upgrade: Nylon Taslon, Water resistant, Mosquito prevention net. Suit for Army forces, special forces, Patrol, Hunting and all kinds of missions. Military rifleman sleeping system. Defence 4 sleeping bag Plus Tropen sleeping bags, 2 bags in one Bivy Nylon Taslon Compression Sack. The sleeping bag which can be used alone or combined into a sleeping bag system. The shell of the sleeping bag is made of nylon Taslon material, which is waterproof. The inner is made of G-loft cotton, breathable, temperature-regulating, moisture-wicking and light and airy at the same time. What makes G-LOFT cotton so special? Insulates like down with absolute dimensional stability. Incomparably light and airy. Optimal ratio of heat output to weight. There is a generous draft tube on the inside of the zipper to prevent heat loss at the zipper. GM Defence sleeping bag. GT Tropen sleeping bag.