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“The Lost Ranger 3N1 20° sleeping bag is part of our latest evolution of the Big Agnes Sleep System. This modular bag design offers just what you’d expect: three bag configurations in one simple, yet technical sleep system.” Combining sleeping bags has long been a choice of ours for a few reasons, including boosting the warmth of an older bag extending its use, or combining separat …

Fill Power Explained Fill PowerThe warmth of a down product comes from the large volume of air trapped inside the shell by the down feathers; Fill Power is the measure of loft of a product that is related to the insulating value of the down or to put it simply, a measure of how well the down will expand after being compressed. This is a key factor that should be taken into account when purchasing …

Why We Choose DownSince our beginning, Western Mountaineering has always felt that high fill power goose down is the best insulation material available. This natural fiber, while highly variable in nature, provides more warmth per ounce than any other material. Down's unique structure is responsible for its tremendous ability to trap warm air. Its filaments are divided and sub-divided to reach out …

Montane Down information page