The one and only Birki clog, also known as the super-birki. Who doesn't know them? Hollands Klompenhuis has a wide collection of Super-Birkis from the Birkenstock brand. The super-birki is a waterproof clog made of polyurethane with a removable cork footbed. The clog is very flexible, making it very comfortable to walk. Ideal for chores in the garden or around the house. In short, the ultimate garden clog!