I'm looking for totally flat insoles, 3mm-5mm, medium density, that I can put under my 3/4 insoles. Basically for the purpose of providing cushioning under my toes, since I'll be removing the original full insole, and also to lift my foot enough to provide a snug and comfortable fit (preventing foot from sliding around inside the shoe).
I keep coming across these Run 619 insoles which are awfully expensive for a plain flat piece of foam, and thicker and firmer than I'm wanting. And then there's the super non-cushioning old timey odor eater type, which are good for nothing. I'd even be happy to get a square of foam and cut them out myself, but not sure kind of foam or where to get. Anyone have any advice on what I can get, and where?