US Army Modular Sleep System (Three Parts)
The MSS consist of three parts: 1) The Bivy is made of GoreTex material and is wind proof and water resistant, 2) The Patrol Bag (green) is rated down to +30 degrees, and 3) The Intermediate Sleeping Bag (black) is rated to -10 degrees. You can use one or all three together. When used with polypropylene under garments all three parts are rated down to -50 degrees.
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