Certifiably Comfortable™ Calling all baristas, restaurant servers, and healthcare and service industry workers of every stripe. If you spend hours on your feet, you deserve a comfortable pair that works as hard (and looks as good) as you do. Think of these reinforced slip-ons as a caffeinated version of Crocs Classic Clogs, all geared up for the grind. Crocs On-The-Clock Work Slip-On Details: Enclosed toe and heel meets workplace standards Fit is relaxed, with tapered fit in the back of the heel for a secured fit Enhanced arch support adds to the comfort Crocs Lock™ slip-resistant treads Dual Crocs Comfort™: Blissfully supportive. Soft. All-day comfort. ASTM F2913-11 tested, CE Certified Meets or exceeds EN ISO 20347:2012, OB, SRC Size Guide: Sold as the US size marked on sole of the crocs. US Size UK Size EU Sizes Inches Millimeters M4 | W6 M3 | W4 36-37 8 5/8 221 M5 | W7 M4 | W5 37-38 9 229 M6 | W8 M5 | W6 38-39 9 3/8 238 M7 | W9 M6 | W7 39-40 9 5/8 246 M8 | W10 M7 | W8 41-42 10 255 M9 | W11 M8 | W9 42-43 10 3/8 263 M10 | W12 M9 | W10 43-44 10 7/8 272 11 10 45-46 11 280 12 11 46-47 11 3/8 288 13 12 48-49 11 5/8 297 14 13 49-50 12 305 15 14 50-51 12 3/8 314