The best way to know your foot type is a podiatrist. In case you can’t run out to the podiatrist, there are other ways you can check to see if you have a flat foot or a high-arch foot. Wet your foot and step onto a piece of construction paper. When you make an impression, it will show you how much your foot is flattening or how high of an arch you have.
Keep silica gel packets in your shoes when they’re not being worn. Have you noticed after purchasing a pair of new shoes those little white packets containing tiny clear balls inside your shoe box? Those packets contain silica gel which absorb moisture and keep your shoes from shrinking. Hold on to those packets instead of throwing them away and stick them in your shoes when you’re not wearing them. You can ask a shoe store associate for extras, if necessary.