The Long Island Modular Sofa by Studio Roche Bobois. Every cover is detachable. With polyester fibers and bi-density HR foam weighing 21 to 30 kg/m3, seat cushions are made of goose and duck feathers and fibers. Feathers and fibers for the back cushions. Solid fir wood, birch and fir plywood, and engineered composite wood are used for the structure. suspension with cross-webbing elastic straps. Beech base with wenge stain. As a straight couch, armchair, and ottoman, as well as in a convertible version, they are additionally offered in several sizes and compositions.