The insulation or "fill" inside a sleeping bag largely determines a sleeping bag's: Weight (and thus its "warmth-for-weight" ratio) Compressibility Durability DownDown is the wispy, fluffy undercoating found just beneath the outer feathers of geese and ducks. This natural fiber is an extraordinary insulator. Goose down is preferred to down from ducks, prized because it is believed its plumes offer a higher "fillpower" (explained below). Down's positives include: It offers tremendous warmth for...
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