There's this area on my upper thigh, that seems to be wearing a lot more and faster than all the other places. The fibres are already torn, so I'm going to be keeping an eye on it to see if it's getting worse. If it's going to tear, then I'll wash the jeans and fix them I think. Will have to see. I've thought of all possibilities, and the only one I can think of is my mobile phone, which is in my left hand front pocket all the time.