The Altra Paradigm 4 is completely updated and revamped with an Altra EGO™ midsole for plush cushion and ultimate energy return; a knit upper for durability, and integrated Stabilipods for enhanced support. The same sweet GuideRail™ system is still here to help steer a tired or pronating foot, and with the addition of Altra EGO™ in the midsole and knit in the upper, this shoe is even more resilient, comfortable and cushioned than before.