bwrote a review of Prana Stretch Zion Pant - Men's on June 26, 2012
Paired with some long underwear, you're good to go for a range of conditions and temperatures. These pants are breathable, stretchy, lightweight, highly water resistant, and they look great.
I'm 6'0, 33/34" waist, 185 lbs. The size large - 32" inseam fits perfect.
I just purchased another pair.