Proper leather shoes

Just go to a place that sells hides and buy a big enough piece to cut two inners out of. With your preferred thickness, get a perfect fit by tracing around each foot and cut out with a sharp knife. Lasts way longer than those micro thin things that shoe stores sell.

to be honest, your foot swells and moves about in the shoe, so the insole, has to fit the internal dimensions of the shoe. as opposed to the actual foot size / shape.