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The natural high-end DownWool Insulation is a blend of 70% high-quality RDS-certified down, which provides high insulation, and 30% wool from the Alpine region, which acts like a lightweight natural air conditioner. The combination is perfect. Nothing insulates as well as high-quality down. The 30% wool content absorbs any moisture that arises and thus keeps the down naturally drier. Down has a ve …

Rab's new fabric, TILT (Thermo Ionic Lining Technology), is used in the inner lining of their top-of-the-line sleeping bags, sleeping mats and down jackets. This technology reflects heat back toward the body, reducing radiative heat loss and increasing warmth. It significantly improves the warmth-to-weight ratio without altering the fabric's original properties or adding weight. At Ultralight Outd …

Mont-bell Seamless Down Hugger sleeping bags are cutting edge, eliminating relatively inefficient baffles from sleeping bag construction and incorporating stretch fabric to improve warmth without constricting the sleeper are two key technologies; on this page we explain those technologies. We asked ourselves, “Is there anything we can do to improve down's ability to insulate?” As ideas were b …

The EN13537 Standard - EN13537 requires a thermal manikin test which produces four temperature results — upper limit, comfort, lower limit and extreme.These Interpret as:Upper Limit — the temperature at which a standard man can sleep without excessive perspiration. It is established with the hood and zippers open and with the arms outside of the bag.Comfort — the temperature at which a standard wo …

When down gets wet, it will lose most of its insulation properties but this is where Hydrophobic down comes in - this is a relatively new concept and the purpose is to solve the main drawback of 'regular' down, which is it's lack of effectiveness when wet.Hydrophobic down has been treated with a durable water repellent that enables the down to dry quicker and resist water for longer, meaning it wi …

Technology Page - Mountain Hardwear Lamina Construction

Western Mountaineering manufactures a broad range of down sleeping bags in different shapes, sizes and shell fabric options. Whether you are car camping with the family, through hiking the PCT, or climbing Mount Everest, we make a sleeping bag that will keep you warm and comfortable on any outdoor adventure.Every one of our sleeping bags is manufactured in the USA, with careful attention to detail …

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 …