Durable? I suppose. I haven't broken them. They're pants.
Reason I ask is I had a pair of Sitka Mountain pants that started to come apart within only a week of hard use.
Right in the crotch I'll bet, seems to be a Sitka problem.
I prefer Kuiu.
200 dollar + pants with that problem. GTFO . The seams are not properly reinforced, the fabric is substandard for sewing or the Chinese seamstresses are incompetent.