I bought these back in 2014 for a training event that I had to go to.  The training event was over two months and consisted of crawling through the dirt and a lot of running.  The pants held up during all events and I have continued to wear the same pair over the years without any problems.  The waist is a stretch waist, so it never feels like the pants are to tight during any physical training you are doing.  It is also nice because as weight fluctuates over the years they still fit comfortably.  The crotch has never torn or stitching expanded and the multiple pockets make it easy to store any gear needed for mission essential training.