there is a reason....
Ask any construction worker and he will say that he has a whole outfit of Carhartt stuff. It may be expensive but they take the abuse un like many other pants. It's not a designer brand They are made to be tough. Definitely worth the extra $$$. They are kind of stiff but after awhile they get a little better. I wear mine at least 2 times a week through rock climbing and random acts of play they still are in great shape. The extra layer of material on the bottom and the knees is a nice touch Pros--- BOMBPROOF. Cons- no gusseted crotch, ridged material. Also check out mountain khakis