MEPHISTO HELLA SPARK | Women Cork Sandals. This marvellously lightweight ladies' toe post sandal, with its relaxed look, promotes a perfect sensation of well-being. The unique SOFT-AIR technology, integrated in the cork midsole, guarantees an effortless walk. The AIR-RELAX technology respects the anatomy of the foot to prevent fallen arches. Adjustable strap with buckle fastening.