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Down Duvets are made from the light, fluffy clusters and plumules that come from beneath the feathers of ducks and geese. The quality of down can be determined by the fill power. Down Duvets are great options for anyone allergic to down feathers or for anyone on a stricter budget. Fill Power. Down fill power is the measure for the amount of space one ounce of down takes up. ... The higher the fill power, the better the insulating ability and loft (fluffiness) a down comforter will have. Fill power is a good indicator of warmth and quality.
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