Goretex is not supposed to literally breathe, just to allow water vapour to pass through from the inside to the outside. It's not perfect doing that, but it sure as heck beats any other waterproof material I've ever tried. Well, except for the clones of the same membrane, all of which seem to work about as well. A lot depends on how the garment itself is constructed around the gore material, single, double, and triple layers are all possible- in decreasing order of 'breathability.' Then there are the pit zippers and so on that I mentioned previously; you have to pay attention and work them. Patagonia, to name one company, has always been very good at making membrane garments for different conditions and levels of activity and, just as importantly, identifying what that level is. What I'm saying is that if you don't find that goretex type materials work, you may not be using them right. Overdressing underneath is a big no-no. And bottom line, I've been up in the hills in cold, soaking rains and sleets when I couldn't help but getting soaked from sweat on the inside, but the knowledge that the rain itself would be far worse kept me happy. That, and the knowledge that I had at least one dry base layer to put on after the exertion was over.