On May 1, 12:26 pm, Bill Tuthill wrote:
Michael Daly wrote:

Davej wrote:
Does this fabric need a protective inner liner?

That depends. If it's three layer, no. If two layer, yes. The third
layer protects the PTFE liner. If the inside of the GoreTex is grey in
colour and has a tricot layer, it's three layer. Some of the light
GoreTex versions have small spots on the inside for a third layer. If
it's plain white, it's two layer.

Apparently Goretex is not the most breathable waterproof fabric.
Here is an interesting, though not totally up-to-date, summary
of US Army research on various waterproof/breathable fabrics:

http://verber.com/mark/outdoors/gear/breathability.pdf
[...]

Interesting, but I wonder how many of these fabrics can be purchased
in small quantities?