Eisengarn

Eisengarn, meaning "iron yarn" in English, is a light-reflecting, strong, waxed-cotton thread. It was invented and manufactured in Germany in the mid-19th century, but owes its modern renown to its use in cloth woven for the tubular-steel chairs designed by Marcel Breuer while he was a teacher at the Bauhaus design school.

The yarn is also known as Glanzgarn ('gloss' or 'glazed' yarn).