Avia - A250w (White/Silver/Submarine/Sky Blue) - Women's: Cantilever(R) System centers the heel over a concave sole which acts like a trampoline to add support, soften impact, and provide increased energy return. Anatomical cradle which stabilizes the heel, centers the foot, and maximizes cushioning for added comfort. Upper consists of lightweight leather, synthetic and breathable mesh with reflective features. Compression molded EVA midsole. Removable molded EVA sockliner. Outsole is solid rubber with forefoot flex grooves.