Endurance Rubber Compound - Formulated for an optimal balance on wear and mixed terrain gr * Comfort Last - Generous fitting and offering a more comfortable style. Ideal for training * Ladies - Built on a last based of an average woman"s foot giving a good fit * Webbing Upper Support - Lacing attached to nylon webbing, cradles and secures the upper be * Terra Shank - A polymer shank positioned behind the metatarsal heads providing underfoot p