Are there better materials? Anything you use is gonna get shredded if you hit it with a saw. It's the stuffing that matters. Nylon might be more abrasion resistant, but it feels terrible against the skin. I wear ACUs+chaps. 50% is as much nylon as I can stand on my skin at one time, and the ACUs are light.
edit:
Just looked at the sales page for the jeans. They come in 32" inseam only. What's up with that? Shorter people can roll them up, but I'd be wearing flood waters :^D
edit2:
I was just thinking what I'd do if I did this professionally. ACUs have pockets at the knees for pads. They could be fitted with cut resistant material, but thighs would still be exposed. I could sew my own pockets over the thighs, but that's more work than I'd like. I wonder how half chaps would work out climbing? Stop them at the knee for extra cooling, and a bit more mobility. That would probably cover >90% of cut incidents climbing, no?