Originally Posted by
nogods
Sock liners are for hiking - to prevent blisters and wick away moisture. They should be used the same as polypro underwear - tight against the skin to wick moisture, and covered by a blended (cotton/polyester or wool blend) fabric that will absorb and evaporate the moisture.
If you have sweaty feet at night, then wearing them will have the same effect as wearing polypro underwear at night. (I use the term "polypro" generically - there are many variations of polypropylene - most of which now contain some type of "anti-bacterial" treatment because polypro tends to stink up from the bacteria that is in your sweat (although scientists don't all agree on the cause of the stink.)
If your evaporation layer is covered by something that prevents evaporation (e.g. a non-breathable boot liner or non-breathable coat) then you have to replace the evaporation layer as it gets wet or the moisture will merely build up and defeat the purpose of the wicking.
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