The A640 is a heavy duty professional work clog with steel toe that is designed for work environments which require extra protection. It is a great choice for kitchens and/or the medical field. The tough polyurethane shell has a steel toe cap and can be sanitized up to 149 degrees. The higher back fits more like a shoe and the cork footbed is removable and replaceable. This style fits slightly longer and a little more narrow than our other professional clogs.