In reply to Outdoor Eddie:
I've just realised I've actually got a pair of these! Not used them for a bit, as I only use them in the cold weather. Very warm and windproof, and so far seem very abrasion resistant. Quite stretchy as well.
Not particularly quick drying, and very little resistance to water at all.
They're a nice, comfy winter pant, but all these wonder fabric claims are a bit dubious. I got mine in a sale and I like them, but wouldn't pay full price.