As seen helping slumbering troops lock in essential body heat during overnights around the world. It's the innermost layer of the U.S. Army's 4-Piece Modular Sleep System.
The Intermediate Cold Weather Sleeping Bag keeps you comfortable from 30°F to -10°F for versatile use in colder conditions. Use it alone, or purchase the other layers of the Modular Sleep System (sold separately) to bolster its temp. range. Get yours here for a surplus price!