Clogs are a type of footwear made in part or completely from wood. Clogs are used worldwide and although the form may vary by culture, within a culture the form often remained unchanged for centuries.
Wooden footwear often ended up as firewood and, because of its nature, wood will rot away in the long run. The oldest surviving wooden footwear in Europe is found in Amsterdam and Rotterdam, the Netherlands, and dates from 1230 and 1280. A klomp (plural klompen) are whole feet clogs from the Netherlands.
Source: https://en.wikipedia.org/wiki/Clog, http://www.weekendnotes.com/interesting-facts-about-netherlands/