Birkenstock sues ‘copycat’ rivals claiming its sandals are applied art

German maker of fashionable cork-based footwear files three lawsuits alleging copyright infringement

Once sneered at as the preserve of muesli-loving, Guardian-reading hippies, Birkenstocks have more recently been promoted to the status of fashion item, not least since they took a starring role in the Barbie movie. But now cork-soled sandals are facing their day in court as their German makers call for them to be protected in perpetuity - and to be recognised as nothing less than a unique work of art.

Germany's federal court of justice is to decide on the future of the ergonomic sandal after three lawsuits against alleged copycat competitors were lodged on Thursday by the footwear manufacturer.