Topic

Dealing with moisture in clothing: vapor state vs liquid state

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PostedApr 12, 2020 at 7:11 pm

Hi, long time lurker, first post here. English is my second language and I rarely speak/write it so please be considerate. Thank you.

I’d like to know more about the pros and cons of a liquid state based moisture dealing system vs a vapor state one. What I mean by liquid state for example would be Polartec Power Stretch Pro tights and hoody on a base layer (I suppose a synthetic hydrophilic -polyester/polypro- base layer would be the better option); everything super skin tight, vs a loose fleece top (and bottom maybe?) on a base layer (I suppose merino would be better in a vapor state system). I know that the typical UL system is a vapor state one (base layer + fleece), but it also needs a wind jacket and a hardshell to work in all conditions and thus loses its breathability under dire conditions, whereas a liquid state one would work under wind (powerstretch pro as a semi wind resistant hard face) and rain (it already works in a wet state, and dries quickly after the effort, being so wicking, thus protecting the wearer from hypothermia).

Stephen Seeber BPL Member
PostedApr 12, 2020 at 8:20 pm

We hike in a wide range of conditions.  Within those conditions, given an appropriate level of wind, precipitation and temperature, a wicking layer may provide excellent performance as an outer layer.  However, under more severe conditions, it may provide inadequate wind resistance, inadequate water resistance and inadequate warmth.  Some of the treatments made to mitigate these shortcomings work better in advertising claims than reality.  For example, a paper I wrote previously, https://backpackinglight.com/forums/topic/non-wicking-polartec-power-dry/  clearly demonstrates that the application of Polartec Hardface prevents wicking.  As a base layer, wicking fabrics can do an excellent job of transporting moisture away from skin.  However, other types of garments may be required to provide adequate warmth or protection from other elements.

PostedApr 12, 2020 at 8:55 pm

Thank you for your answer,

what do you think would be the best usage of such a layer (wicking material but with a hardface)? I use Powerstretch Pro but I guess it’s comparable to powerdry with a hard face

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