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Is 700 fill down warm?

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Usually, a manufacturer will advertise a " fill -power" of 650, 700, 850, etc. and these numbers are a reference to the quality of the down insulation used. If you use two ounces of 800 fill on jacket A, and two ounces of 700 fill on jacket B, jacket A — with the 800 fill down — will be warmer because it has more loft.
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