I am a new runner, and all I knew was that I needed something to help my feet. I looked up this 'over-pronation' thing, and didn't really understand it, although it looked like that's what I did. i was very doubtful when buying these, so I got the ones with free returns, just in case.
  These are the BEST purchase I have made on amazon. Or ever. I don't have to think about where I put my feet anymore when I wear these! it makes running a lot easier, and a lot more fun. if you're not sure whether these would help you, definitely give them a try!