Originally Posted by
DasProfezzional
WOOL.
Seriously. I don't want to sound too Rivendell-y, but it's the best for the wet and cold. Like everybody's already said, nothing's going to keep you dry in real, pounding rain. Wool will keep you warm.
This. In cold, wet weather, the only things you should be concerned with are your toes, fingers, and ass. Two might frostbite and the last will have saddle sores.