Unless you are in very hot water, the condensation point of the vapor will be less than the temperature of the water. The vapor will condense as it cools, once condensed it can not travel through the membrane. Ther may be some minor thing happening under the conditions, which occure most of the time that keep the vapor from escaping, but I don't know of them. I also must sweat way more than most becasue I have never had dry cloths inside my waders regardless of what type I use. In warm weather I can usually ring water out of my socks. Tightness of the waders will also make a big difference. With the right cloths while xcountry skiing I have steped into a stream while crossing and never gotten uncomprotabe during the balance of the trip even though the inside was soaked and the outside became frozen. I have also collected a half inch of ice crystals between the shell on the outside and the last inside garment.
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