duvets were filled with down, the soft inner plumage of waterfowl such as ducks and geese. The light, fluffy filaments in down provide loft which traps the air to provide warmth and springs back into shape if compressed. Down is more expensive than feather fillings, with goose down being the softest and most costly. Natural down and feather fillings are more comfortable in all seasons than synthetics because of their wicking capabilities (ability to let moisture escape). Natural fibres are also very light and thus very comfortable to sleep under.
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