Updated February 2026: We’ve added a new section on caring for down and some notes on Outdoor Vital’s Zero Stitch fabric.
What Does Down Fill Power Tell You?
The higher the fill power, the greater the loft. Down puffer jackets and sleeping bags keep you warm by trapping the warmth coming off your body, retaining it in air pockets between the down. A higher down fill power means the down has more loft, which means there are more air pockets, which means that more heat is retained. If everything else is…

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