Ok-we went through seveal pairs then...I just gave up, if he was playing outside, riding bikes, getting dirty in the yard...he wore and I washed the ones with the holes until they were beyond help. I kept the nondamaged jeans for use in public (trips to the library, shopping, the doctor, etc.). Of course once a knee is beyond help it is tempting to go for shorts, all you need is scissors. But I think then I'd be back to only for getting dirty and save the better shorts for public. I really like jeans from Land's End, LL Bean, Gap, Old Navy, Levis. Gymboree also sometimes puts extra thickness in their knees too. Sometimes survival time is not the brand but the "wash." Some of the facy, semi-bleached styles seem to wear out faster than traditional jeans. Also, sometimes carpenter style seem to be heavier than regular.