Jacob Torreywrote a review of Arc'teryx Zeta AR Pant - Men's on November 5, 2013
Familiarity: I've used it several times
Fit: True to size
Used this when trekking in Nepal during a freak snowstorm that dumped 6' in 2 days. Was working to helicopter evacuate someone, and also up on the roof removing snow from solar panels. Even breaking new trail my legs stayed dry and happy, no rips from kneeling on roofing rivets.
Quite warm, even unzipped, in the sun with the black after getting below snowline I had to stop and take them off (though there was really no reason to have them on at that point). The 3/4 leg zips make it possible (though awkward) to access pants pockets under these (which have no pockets).
5'10", 150lbs, a M fit great over some hiking pants.