I gave these Riggs pants a 4 for a couple of reasons, none of which concern durablility or function. On the plus side, these pants are extremely heavy duty work pants. Something I am getting used to after wearing Red Kap 100% cotton for many years. The Riggs cotton/cordura is a heavyweight fabric which should wear like iron. Plenty of pocket/pouch room for tools, parts, etc. I do maintenance work in a medical facility and the tool space is perfect for me. The pants are stiff out of the package. Had to wash several times in a row to get them to loosen up, but they are comfortable now. You have to expect some break-in with a fabric of this blend and weight. I will expect more comfort as time and washings go on. The double knees are not noted on the website and add to the stiffness, but certainly do add to the durability as well.
On the minus side, one pair of pants came through minus three belt loops on the right side. That and the many loose strings/threads which weren't trimmed/removed leaves me to think quality control is lax at the factory. Also, these are cut "big", i.e. the relaxed fit is very relaxed. I was wearing 46x30 in Red Kap (granted the cotton probably did shrink a bit) and those were fairly snug. As I am losing some weight, I ordered 44x30 in the Riggs and they are actually loose at the waist and long on me. With the cordura in the fabric I don't see these shrinking much. Other than that I have absolutely no other complaints on the Riggs workwear.