Fill Power

      Fill power refers exclusively to down outerwear.  More specifically, it is how “full” of down the garment is.  When purchasing a down jacket, somewhere on the jacket will be a number that indicates the fill power.  The fill power is a measure of down density; it is how much space an ounce of that density down will fill, in terms of square inches.  For example, a jacket that has 700-fill down means that an ounce of that down will expand to fill 700 cubic inches.  Therefore, a jacket that has a higher fill power will usually be warmer.  Fill power numbers usually go from about 500, all the way up to 1000, in increments of 50.

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