Altra EGO™ foam midsole and our Standard FootShape™ Fit designed to take you from your morning run to your morning meeting.   Features & Benefits Footshape: Our signature FootShape™ comfort gives your feet more space to sit naturally and is designed to address biological differences in men's and women's feet. Altra EGO: Our original Altra EGO™ foam is designed to harmonize the balance between responsiveness and comfort. Balanced Cushioning: Our Balanced Cushioning™ platform positions your heel and forefoot at an equal distance from the ground, encouraging better alignment and form. gently used womens 9