The LC3 implements the logic of modernity separating the supporting metal frame from its padded elements like the architectural relationship between the concrete supporting structure and its buffering elements. The model has been updated in an ecological version that respects both the original design and nature, which has always been a constant source of inspiration for Le Corbusier, Pierre Jeanneret and Charlotte Perriand. 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 foamed elements have been integrated with eco-compatible polyols, deriving from bio- renewable sources, and a blown fibre, obtained from PET mainly recovered from the sea, has been introduced into the padding of the cushions and seats to make it more comfortable and environmentally sensitive. The tubular frame of the Fauteuil Grand Confort Durable is in brushed nickel with a semi-opaque finish, a material that stands out for its more sustainable production process. These ecological options are available for all models of the LC3 armchair and sofa.