The Crocs OTC Work Slip On is a caffeinated version of Crocs Classic Clogs, completely geared up for the grind. This clog is for those from the healthcare and service industry who spend hours on their feet. The On-The-Clock work slip-on features an enclosed toe and heel that meets workplace standards. The tapered fit in the back of the heel provides a secured fit and relaxed fit. Inside the enhanced arch support adds to the comfort and on the bottom is their Crocs Lock™ slip-resistant treads. This is ASTM F2913-11 tested, CE Certified and meets or exceeds EN ISO 20347:2012, OB, SRC.