Brian,
You may be right in your considerations regarding breathability and its limitations. I have no scientific evidence to prove the opposite. But I have fished in the winter as long as I remember and I have worn the right clothes under my neoprenes. My empiric findings were:
- My waders were always moist on the inside after a day's fishing (wet, actually)
- My clothes were damp, particularly over the knees
- I froze
I have worn 5 mm Orvis and Bare neoprenes - the latter being regarded top notch by most people I know.
Being out on extremely cold days doesn't make me more moist. It might be because I sweat less. On sunny summer days sweat runs off me in litres and my breathable waders are again moist on the inside. My (again empiric) experience tells me that the colder it is the dryer I am.
And regarding the breathability under water. What would hinder the vapor in "fusing" with the outside water? Not being a physicist I can't explain or fully understand the molocular details in this process.
No matter what: I freeze less than ever and so does most of my fishing buddies. And none of us ever wear neoprenes anymore. And yes: we do fish in the winter!
Martin
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