Birkenstock

 
Pronunciation: /ˈbəːk(ə)nstɒk/

noun

trademark
  • a type of shoe or sandal with a contoured cork-filled sole and a thick leather upper.
  • [as modifier] denoting people concerned with political correctness or Green issues: homebuilders are no longer content to leave environmentalism to the Birkenstock crowd

Origin:

1970s: from the name of the manufacturer