Vionic with Orthaheel Technology Women's Zoe Casual Slip-On Leather Twin gore on medial and lateral side for comfort. Medium Width. Contrast stitching on the vamp. Features Orthaheel's premium Active removable biomechanical orthotic footbed. Flexible and lightweight rubber outsole with wave-patterned tread helps improve traction. Invented by leading Australian podiatrist- Phillip Vasyli- this shoe features biomechanical orthotic technology that supports your feet and helps realign the lower legs- reducing over-pronation and associated aches and pains.