Casual clog has slightly raised back for a more secure fit and a heavier sole for improved slip resistance. Cotton lined, cork/latex footbed is removable, replaceable and so very comfortable. Download the foot measurement template here to find your perfect size. Available with Electro Static Dissipative footbed tested and approved within ESD standard requirements. Find Your Birkenstock Size Here! Birkenstock Size Chart: Adult Unisex Outsole: Electrostatic Dissipative (ESD) Upper: Polyurethane This style is available in whole sizes only and tends to run large. If you normally order a 1/2 size it is recommended that you order the next full size down. For example, if you normally purchase a size 6 1/2 we recommend purchasing a size 6.