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What is 800 fill down?

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Technically speaking fill power is a measurement of the amount of space one (1) ounce of down (as shown in the cylinders below) will occupy in cubic inches when allowed to reach its maximum loft. For example, one (1) ounce of 800 fill power goose down will loft to 800 cubic inches.
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What does down fill power rating mean in jackets?



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