Vionic by Orthaheel - Sprint - Womens Slides Black - 9 Synthetic Sporty and cool, these Vionic&reg; with Orthaheel Technology&reg; sandals are ready for the beach and beyond. 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. Click here to view Seal. Synthetic upper in a sleek silhouette. Textile lining with a molded synthetic footbed. Lightweight, flexible medium-density EVA midsole absorbs shock to reduce stress on the feet, ankles and knees. Durable Vibram outsole with wave-patterned tread provides traction to maintain your confident stride. Care: Wipe off with damp cloth and air dry. For further information on the benefits of Orthaheel footwear, please visit our Zappos blog: How Orthaheel Can Help You Imported.