Which architectural firm is renowned for pioneering and branding itself through the extensive use of ETFE (Ethylene Tetrafluoroethylene) membrane technology in landmark projects?

In the world of architecture, certain firms have become known for their distinctive use of materials that define their brand identity. These signature materials often become inseparable from a firm's design language and recognition in the industry. This trivia question tests your knowledge of which pioneering architectural practice is most closely associated with a specific material innovation that has become central to their brand recognition.

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Herzog & de Meuron
Foster + Partners
Zaha Hadid Architects
Grimshaw Architects