Running Shoes

Things you should concern are as follows..

Wet Test for Arch Type: 1. Pour a thin layer of water in a shallow pan. 2. Wet the sole of your foot in the pan. 3. Step onto a shopping bag or a piece of heavy paper. 4. Step off and look down at the mark on the bag or paper.
Arch Types: Normal Arch (medium) If you see about half of your arch, you have the most common foot type and are considered a normal pronator. Contrary to popular belief, pronation is a good thing. When the arch collapses inward, this "pronation" absorbs shock. As a normal pronator, you can wear just about any shoe, but may be best suited to a stability shoe that provides moderate arch support (or medial stability). Lightweight runners with normal arches may prefer neutral-cushioned shoes without any added support.
Flat Arch (low) If you see almost your entire footprint, you have a flat foot, which means you're probably an overpronator. That is, a micro-second after footstrike, your arch collapses inward too much, resulting in excessive foot motion and increasing your risk of injuries. You need either stability shoes, which employ devices such as dual-density midsoles and supportive "posts" to reduce pronation and are best for mild to moderate overpronators, or motion-control shoes, which have firmer support devices and are best for severe overpronators, as well as tall, heavy (over 165 pounds), or bow-legged runners.
High Arch If you see just your heel, the ball of your foot, and a thin line on the outside of your foot, you have a high arch, the least common foot type. This means you're likely an underpronator, or supinator, which can result in too much shock traveling up your legs, since your arch doesn't collapse enough to absorb the shock of your foot hitting the ground. Underpronators are best suited to neutral-cushioned shoes because they need a softer midsole to encourage pronation. It's vital that an underpronator's shoes have no added stability devices to reduce or control pronation, the way a stability or motion-control shoe would.

Shoe Types: Cushioning Shoes (neutral) A Neutral Cushioning shoe is best for runners with a high arch who do not pronate effectively. These shoes do not have medial supports but are more concerned with midsole cushioning. The midsole will provide the extra shock absorption that the underpronator needs. Neutral Cushioned shoes also work well for midfoot and forefoot strikers.
Stability Shoes Stability shoes are for runners who have normal or medium arches who are mild to moderate overpronators. These shoes have some medial support and good midsole cushioning. Because normal or medium arches are the most common foot type, most runners will need Stability shoes.
Motion Control Shoes Motion Control shoes are for runners who generally have a low or flat arch and are moderate to severe overpronators. These shoes employ extra support devices on the medial side to slow excessive pronation and tend to have wider and flatter outsoles. Heavier runners who need extra support and durability may also want Motion Control shoes.