Insoles are funny little things. Most of our walking and running, and boots, come with removable insoles. Typically, we buy a pair of shoes and wear them until they wear out—without ever thinking about the insoles under our feet. You may think insoles are similar but they differ quite a bit. They range from rigid to flexible, cushioned to hard, no arch to high arches, low to high heel cups, one material to multiple substances, cheap to expensive, and in a multitude of coverings.  …

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