Women’s Birkenstock Bend Low size 39. Like new/in excellent used condition. See all photos. The BIRKENSTOCK® Bend - Leather sneakers boasts a simple design which can be worn with almost anything. The casual sneakers have an additional midsole made of PU and cork to ensure optimum shock absorption. It also features a breathable microfiber lining for a comfortable foot climate. The upper is made of high-quality, soft natural leather.