I wanted to start a new thread for you, the other one was getting long......
Most people with low arches tend to over pronate, so when you stand you roll your ankle in and look flat footed. The important thing is to get a shoe with stability. I have been a runner my whole life and have dealt with pronation.
"The main technology found in Stability shoes is a
medial post of dual density foam. Footwear producers inject a harder compound of foam right below the medial side of the arch and sometimes extended all the way to the heel. It is easily recognizable as a darker (almost always gray) piece of foam on the inside of the midsole (view picture).
www.runningshoesguru.com/wp-content/uploads/2009/04/asics-gt-2140-duomax-detail-300x57.jpg" alt="Dual Density Post" title="asics-gt-2140-duomax-detail" width="300" height="57" />

