There has been talk lately about some of the lesser fill power down being better against humidity but what is the difference between say, 550 v 650 v 750 in this aspect? Like if you go 750 you won't notice much beyond 850 or 900 or that by going lower than 550 you don't gain anything?
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Differences in lesser fill power down and humidity?
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All I know is that my "low fill power" Outdoor Research Transcendent beanie has become my winter cycling hat and despite sweating gobs of sweat into it every ride it continues to loft and be warm and comfortable as soon as it dries out.
In fact, it is even reasonably comfortable and warm when wet. So now I save my Black Rock hats for hiking and sleeping.
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