About this item Go Further: Our GuideRail guidance system provides extra medial support when you need it most and our FootShape toe boxes allow toes to splay for natural foot positioning and comfort Stay Comfortable: The updated Innovarch arch feature encourages better foot placement in each step and the Altra EGO Max cushioned midsoles are light, luxurious and responsive Push Yourself: Balanced Cushioning places your heel and forefoot the same distance from the ground to encourage proper, low-impact form throughout your run Stay Focused: 30 mm stack height provides ample cushion for long runs Used condition but still has life left in them!! So comfortable.