The Altra Paradigm was originally inspired by tired feet at the end of the Badwater 135. With the 4.5 version we continue to innovate the design and function. The Altra EGO midsole gives you performance and cush while the knit upper brings you endless comfort. The unique take on a guidance system definitely makes this shoe stand out from the crowd, the system includes integrated StabiliPods for a stable platform and a GuideRail system for support just when you need it most. With an asymmetrical design and medial flaring lateral, this shoe offers increased for weak or tired feet, and is great for both neutral runners and those looking to upgrade from over structured "traditional stability" options.