Offering a snug and comfortable fit, the Altra Women's Vanish Tempo Running Shoes feature a sock-like engineered knit upper that securely wraps the food and allows your feet to breathe so your temperature stays regulated when you pick up the pace. A traditional lacing system gives a lockdown feel and a roomy FOOTSHAPE™ toe box allows your feet and toes to splay naturally with each stride. At the midsole, Altra EGO™ Pro cushioning gives responsive comfort and an Active Stance Rocker propels you forward for an energetic ride. Finished with a durable outsole with FootPod™ technology to enhance flexibility. Balanced Cushioning With a zero-drop construction, your heel and forefoot are placed at the same distance from the ground ensuring comfortably balanced cushioning that promotes efficient low-impact form with each stride. FOOTSHAPE™ toe box Enhancing both comfort and stability, the FOOTSHAPE™ toe box gives enough room to allow your toes to relax and spread out naturally as you move. ALTRA EGO™ dual midsole Combining dual-natured midsole compounds the ALTRA EGO™ delivers premium underfoot cushioning with increased energy return snappy ride with forward-propelling responsiveness. Active Stance Rocker This rocker is located 65% forward up the foot when measured from the heel - the farthest back of any altra shoes - designed to provide a more efficient toe-off in every stride.