The Altra Paradigm 4.0 running shoes features an updated look and feel to make this cushioned favorite a big hit with serious road runners. The AltraEGO™ midsole and StabiliPod™ offer supreme comfort and support. The classic high volume fit and bunion window that Altra is known for continues to offer the best fit, even for those who wear orthotics. Upper: Updated knit upper for ultimate, breathable flexibility. Padded heel collar enhances comfort. Flat laces reduce irritation. Features an updated bunion window. Midsole: AltraEGO™ midsole for stable cushioning. Zero Drop™ places the heel and forefoot the same distance from the ground to encourage natural, low-impact running form. Removable insole. Features a Guide Rail for further stability. Outsole: Integrated StabiliPods™ provide further support.