uh.. how can it be "windproof" AND "breathable"? The bad wind can't get from the outside in, but good ventilation air can get from the inside out?
And if they are referring to moisture transport and not air permeability, then is it a claim that water vapor can get out, but Ni, O2 etc. can not get in? Pretty amazing claim a la goretex.
Sorry Im jaded, my Marmot Ion is made of this stuff acording to the manufacuturer, and it is like a trash bag with arms. I get tired of these ridiculous claims.