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You said that sweating creates higher pressure inside the garment than outside. If that were true a drysuit would blow up like a balloon over the course of the day. It would also mean that Gore-Tex ski coats would never breathe at all since they are not pressure-tight garments (not that paddling gear is particularly pressure-tight either).
What actually increases inside are relative humidity and temperature, the latter of which leads to greater *vapor pressure* of water. The highest relative humidity can go is 100%, and then you get condensation into liquid water. Vapor pressure tells you how fast that water will re-evaporate, which is the main process in Gore-Tex's breathability.
You also said that water can clog the pores in the ePTFE membrane. This is also not true because ePTFE is hydrophobic and repels water. Naked Gore-Tex, without any surface fabric on it, beads water very well on its outer surface.
You obviously think I'm full of it, but if you're really actually curious you should try contacting Gore and seeing what they say. On the other hand if you just feel like fighting, it's been fun. :-) |
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And you do? New 
BoaterTalk 
