Nurses. Warehouse crews. Line cooks, stylists, teachers.

Eight to fourteen hours on concrete, tile or steel deck, in shoes somebody else picked.

Most of them have bought insoles before. Two pairs, three, five.

It usually goes the same way. The first week feels like the problem is solved. Month two is fine. Somewhere around month three the foam has packed flat and the mornings are back to what they were.

The easy explanation is that the body is wearing out.

That's where most people land, and it's why a lot of them stop buying anything at all. If the cause is age, or weight, or twenty years of standing, then there's nothing to buy. There's only something to put up with.

Here's the part that isn't printed on any box on the shelf.

Nearly every insole in that closet was built around one thing: the arch. Arch height, arch shelf, arch support. It's the claim on all of the packaging, and it isn't a lie — the arch is real and supporting it does real work.

But the sharpest heel pain in this line of work doesn't start at the arch.

It starts about an inch behind it, underneath the heel bone, where the body keeps a shock absorber of its own: a dense pad of fat built specifically to take impact, and better at it than any foam.

That pad only works while it stays thick. Under body weight it spreads sideways, and when it spreads, it thins. A thin pad passes more of every step straight through to the bone.

Flat insoles let it spread. Soft ones let it spread further.

So those three pairs weren't a waste of money because of bad judgement, and they weren't nothing. They were doing an honest job on the front half of the foot while the back half kept getting flatter underneath.