Orthaheel Vionic Technology Women's Olivia Ballet Flat,Black Patent,Us 8.5 Synthetic Rubber sole Casual/dressy style with orthotic support. Fits medium width. Flexible and lightweight rubber outsole with patterned tread helps improve traction. Includes Orthaheel's multi-density microfiber covered orthotic with an EcoFresh topcover for support and a healthy foot environment. 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. To clean- wipe off with damp cloth and air dry under indirect sunlight only. Do not submerge in water or use solvents to clean products. Do not expose to extreme temperatures. Commercial dry cleaning or home wash/dry laundry machines are not recommended.