I bought two pairs of the REI MIstral pants years ago on half-price sale. Aside from a little problem with some leaking acid from an Aqua Mira bottle, they are in great shape 10 years later. Stretchy, not too heavy, easy to wear. I don't normally like to hike in long pants, but in very cold weather or for other outdoor activities, these are great. I even wear them to work occasionally.
I see REI no longer carries the pants in Khaki color -- too bad.