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Q&A Different kinds of Down: comparing insulation

There's many different kinds of "down" filling: "100% down" must legally be only down, while "down" can be any mixture containing down. Then there's "fill power" ranging from about 400 to 1200, wh...

2 answers  ·  posted 11y ago by themirror‭  ·  last activity 8y ago by System‭

Question gear insulation
#2: Attribution notice added by user avatar System‭ · 2020-04-17T22:15:52Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/q/3835
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/
#1: Initial revision by user avatar themirror‭ · 2020-04-17T22:15:52Z (over 4 years ago)
<p>There's many different kinds of "down" filling:
"100% down" must legally be only down, while "down" can be any mixture containing down.</p>

<p>Then there's "fill power" ranging from about 400 to 1200, which basically measures how resistent the feathers are to crushing by weight.  Higher "fill power" provides more insulation and is significantly more expensive.</p>

<p>Is there any quantitative data about just how much the thermal insulation ability VARIES from the "worst" down to the "best" down?  In other words, is it possible that spending 10X as much $$$ on high-end down can make a significant difference in insulation, or is it negligible? </p>