My wife is tempted by the "iron knee" pants from Lands End. Does anyone have experience with these?
I can tell you how to make them yourself, and it doesn't even require sewing. My mom used to do this with all our jeans. Since we were a family of five kids, we were only allowed three pairs of jeans every fall (and then they were cut off for shorts in the summer). I don't remember any of us ever having a rip in our pants:
Buy a pair of iron-on patches from the Walmart sewing section. Color doesn't matter because the patches won't show. These are sold in pairs, but if you're working on a small child's pants, you might be able to cut the patches in half and get two pairs of pants from one set of patches. Don't skimp -- the patches only cost about $1.
Start with NEW pants. The idea is to prevent the rips from ever beginning -- if you already have rips, it's not going to work. Have the child put on the pants, and mark (with a pin) the middle of the child's knee.
Turn the pants INSIDE OUT.
Position the patch on the INSIDE of the knee.
Iron it on, taking care not to allow it to overlap the seams. The patch will stay flat and nice if it's on one piece of solid material.
Those knees will NEVER wear out. The kid will ruin the seat of the pants long before you even show wear on the knees.