I love my Gore-Tex socks. I have been wearing them in the rain. And in the cold. And in the cold rain. And my feet have never been cold or wet.
Well, there was that one time I got caught in the rain. The water ran down my legs and into these socks, but even though my feet were riding in a pool of water, my toes still never actually got cold. It was like a little hot tub in there.
Yes, my feet do have a tendency to sweat in them on the warmer rainy rides and I would guess in snowy conditions this could create a problem on really long rides. But, I am sticking with what I said before. I love these socks.
They are waterproof, windproof, breathable and have a touch of reflective material. If you ride in the cold and rain, do not delay, get some sockies for you toesies.