Sofa with backrest frame with steel insert embedded  in cold-expanded polyurethane foam. Seat chassis in tubular  steel 20x20 mm thick, sprung with coated rubber elastic  straps, padded in polyurethane foam and fixed to the backrest  frame by steel plates. Lining in 100% polyether thermally bonded onto a polyamide  velveteen backing and needle punched, resinated, nonwoven  polyester fibre, bonded onto a polyamide velveteen backing. Steel feet Ø18 mm lacquered with epoxy powder coating  gunmetal grey colour, screwed to the backrest frame  with a bushing. Adjustable black PVC tips. Fabric or leather upholstery; the fabric version only is fully  removable by zippers and Velcro fastenings.