Crocs Classic Work Clog When you're working for long hours, the Classic Work Clog gives you the comfort and features that work as hard as you do. Designed with food service, hospitality and healthcare workers in mind, these clogs feature Crocs Lock slip-resistant tread Fastening:Adjustable Backstrap Material Composition:Other Materials/Other Materials/Other Materials Lightweight, yet durable all-day comfort. Pivotable, adjustable backstrap for a customized fit. Crocs Lock slip-resistant tread. Fully moulded and easy to clean with soap and water. Enclosed toe design and waterproof upper help protect foot from spills. Iconic Crocs Comfort: Lightweight. Flexible. 360-degree comfort.. Refer to Unisex Size Conversion. Product Sole displays US Size not UK..