Avia - 357 (White/Twilight Blue/Dapple Grey) - Women's: Set your pace in comfort and style!; Cantilever System technology which centers the heel over a concave sole. The concave sole acts like a trampoline to soften impact, stabilize the heel and provide increased energy return. Leather, synthetic and mesh upper for excellent durability. Removable molded EVA sockliner. Compression molded EVA midsole. Two piece solid rubber outsole with exposed EVA.