 The Happy Medium Blue Ice down sleeping bag is Medium sized for people 5' 8" and under. It's ideal for women and youth. "The Backside's Got The Fill Power!" This means that The Backside sleeping bags have tons of loft in their down fill. Higher fill power means it also lasts longer. Fill power = the space one ounce of down occupies in cubic inches. The backside uses 700 down and 750 premium goose down in their bags. 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 anything else around. Down fill's unique structure is responsible for it's tremendous ability to trap warm air. It's filaments are divided and sub-divided to reach out into it's surroundings to create dead air space that slows the movement of warm air. Because of this, down filled bags are 35% lighter than synthetic bags. It is also much more compressible than synthetic insulations which can make all the difference when space is crucial. Overall, down provides the most warmth with the least bulk. Most people who take care of their down filled bags can enjoy longer longevity with down rather than synthetic hollow fiber bags. Although down may be more expensive, it is worth it in the long run.
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