The Avia Avi-Motion series is "toning in motion"; a shoe that helps tone your body while you walk. This lightweight shoe features negative heel engineering which promotes muscle activation while a forefoot flex grooves allow for natural Dorsiflexion. This shoe employs Archrocker® which is a time tested and American Podiatric Medical Association approved design that enhances the users rocking motion from heel to toe in the gait cycle. Also utilized is a Shear Cantilever® System. This system accelerates the heel area's ability to rebound to its natural state in time for the next heel strike.