That Schoeller stuff is SO goodeverything you see is either it, or a close knock-off. I have a pair of Arc'teryx Gamma LT pants ($169), made with a light Schoeller fabric, and they are great. Study, comfortable, and ideal in cool temps for climbing or hiking.
The Gamma LT pants
Patagonia's Simple Guide pants ($125) are so similara light, tough pant for hiking/climbing in cool and maybe a little bit damp conditions. They also offer some warmth if layered under a shell. The Gamma LTs are a bit better tailored, but there is not a mile between them.
I also like Outdoor Research's Exo Pants ($165). More of a home-grown fabricCordura nylon outer with a lightly insulated polyester liner. Very tough, with a wide temperature range. A little warmer than the two I mention above. Water-resistant, and plenty of pockets for stuff.
Overall these materials really change the dynamic of what you need to wear. They are light and moderately warm, and in many cases replace a pair of long underwear and an accompanying shell. Great for cool-weather rock-climbing or hiking, and in summer months suffice as a high-altitude pant. With a bit of backup (long underwear) theyre also okay for something like an August Rainier climb.