I've had these pants for a few years now. I've had to fix or replace them because of ripping 3 separate times. I wasn't doing anything particularly crazy either, in fact I was just doing a simple squat all 3 times these ripped. I've tried on a larger size that belonged to my friend before. Far too big, the size down from what I wore, far too small. But the size that fits me best, has still ripped 3 times doing a basic, standard movement. I am admittedly very dissatisfied, I never encountered this issue with the old cotton canvas iron man pants, in fact they only ever got replaced because after' years of wear the knee would get worn through. Yet the improved" version somehow has a problem the old ones never had.