Certifiably Comfortable™ Made for on-the-job comfort. Roomy by design like the original Classic Clog, the Mercy Work Clog offers generous room all around the foot. It has Crocs Lock™ tread for slip-resistance, a heel-hugging backstrap, and a closed heel. Roomy fit, like our original clogs, for maximum comfort Designed for work environments: laboratories, schools, medical facilities and more Crocs Lock™ slip-resistant tread Easy to clean with soap and water 1.3-inch / 34mm heel height Tiny nubs along the footbed provide a massage-like feel Enhanced arch support and footbed Pivoting heel straps for a more secure fit Iconic Crocs Comfort™: Lightweight. Flexible. 360-degree comfort. ASTM F2913-11 tested, CE Certified Meets or exceeds EN ISO 20347:2012, OB, SRC