for a visual display of how Vionic with Orthaheel Technology can align your foot and leg. The Cairns Slingback Mule has understated sophistication with undeniable comfort and suitable for nearly any occasion. Innovative, podiatrist-designed Orthaheel Technology provides superior orthotic support, relief, and stability to help realign the feet to their natural position. Research supports Orthaheel Technology's success in reducing over-pronation, which can help relieve associated common aches and pains, such as heel pain (plantar fasciitis), knee pain, and lower back pain. Received APMA Seal of Acceptance. to view Seal. Synthetic leather upper with a decorative buckle at vamp. Slingback strap with hook-and-loop closure allows for a secure fit with plenty of adjustability. Man-made jersey lining keeps feet cool and dry. Microfiber-lined EVA footbed will cradle the foot in comfort and support. Flexible and lightweight rubber outsole with patterned tread. Imported.