Recommended For: Mild Overpronators, Neutral Runners who overpronate over long distances, equipped with Nike+ technology (which communicates running information to your iPod) and created with Lunar Foam Technology. This technology was originally introduced by NASA in order to save weight in space but was regenerated and used in running shoes because it can compress and return to regular shape with every step. Retail price: $99 (plus available customizing with Nike iD)