Duc is an original project from 1976 founded on the combination of cutting- edge materials and structural technology. While respecting the innovative and sophisticated character of the original design, Cassina renews and updates this sofa, both in terms of comfort and the size of the seat, while maintaining its characteristic panel structure assembled by means of a zip that runs along the sides for its entire height. Thanks to the study carried out by Cassina LAB, a collaboration between the Cassina Research and Development Centre and Poli.design at the Milan Polytechnic, the cushion padding in polyurethane foam is wrapped with a 100% recycled fibre, obtained from PET mainly recovered from the sea, guaranteeing comfort and respect for the environment. This new version does not include side cushions like the original model however it is possible to add optional armrest cushions. Duc-Duc is available in a two or three-seater sofa and armchair.