I’m going to disagree with you guys here. I don’t think something disintegrating after 20 feet is acceptable. I would be fine with it if it was advertised or branded as such but its not. It’s all a bit of a crap shoot how much protection any piece of clothing gives you as far as I can tell. Yes, we all know mesh is not going to give you as much protection as leather but how much less is it? And just how good is a cheap pair of leather pants? My expensive RevIt textile is claimed to be more abrasion resistant than leather. And the Motoport stuff is claimed to be the best.
I guess it comes down to how fast to you have to be going to slide 20ft? Lots of variables in there but my pulled-out-of-my-ass estimate would be 30 ~ 40mph. I would be pissed if my pants melted onto my ass at that speed.