Birkenstock Professional QO 500 Non Metall O2 Natural Leather Work Shoes - BlackBIRKENSTOCKs QO500 work shoe with a removable footbed offers firm grip and takes the strain off your feet, allowing you to stand and move around comfortably at work for many hours, even in demanding environments. The QO500 is presented as a simple, modern sneaker with 6 hole lacing. The nonslip and oil and petrol resistant outsole provides for energy absorption around the heel. The upper is made from water resistant smooth leather (WRU) and offers