Only worn once, and decided I wanted to get the fleece lined clogs instead. Couldn't return because I'd trashed the box. These are comfy and in excellent used condition. Size 40, which is equivalent to a US 9. The BIRKENSTOCK Buckley is a moccasin-style clog with a unique integrated molded cork latex footbed for ultimate comfort and all day support. This version comes features a fully adjustable in step strap and EVA sole that provides additional cushioning. The upper is made from oiled nubuck leather, and the footbed is suede.