Reader Rick asks “If I have flat feet, should I wear an orthotic, or wear a motion control running shoe? Or, can I have both or will this cause too much stability and actually make me a supinator?”
It all depends on whether or not you are having problems. If your foot is just flat, than a motion control or certainly a wider outsole shoe would be recommended for you. Motion control shoes usually have a firm heel counter (non-collapsible) a stiff footbed below the sock liner and a firm EVA midsole, which are all designed to prevent excessive pronation (foot collapse inward).
What a motion control shoe may or may not have is a stable upper, which is also necessary for proper support and pronation control. If your podiatrist determines you need an orthotic (excessive pronation), a motion control shoe can help, but you will still need the orthotic.
Don’t worry about the shoe and the orthotic causing supination (turning outward) as the combination won’t have that effect. Worst case scenario, you will have more control than you need, but this shouldn’t be a problem.