Note: Birkenstock shoes run large. We recommend purchasing one size smaller than your usual size for a regular width sandal. The Birkenstock Arizona Suede Soft Insole Regular Sandal features a flat heel and a fantastic cork insole that perfectly conforms to the shape of your foot. Soft and flexible suede Ergonomic cork insole Inner and outer longitudinal arch support Deep heel cup and spacious toe box Suede-lined collar High insole edge Lightweight EVA sole for cushioning and shock absorption