In reply to SethChili:
I wear Rohan trousers with the 'Barricade' membrane. Warm, but not hot, I don't get sweaty in them, and I was surprised to find out they're actually very waterproof, however you do need a log jacket to cover the top inch or so of the zipped fly, as the waterproof flap doesn't quite protect that area. Very impressed, and machine washing when they're muddy doesn't hurt them any.