Modular seating system consisting of two and three seats sofas, left and right elements with armrest, central elements and platform. Steel structure provided of elastic belts; feet in stainless steel with a satin finish or matt lacquered in avorio or grafite colour. Plastic spacers. Backrest structure made of spring steel and ABS. Padding in stress resistant, differentiated expanded polyurethane. Removable seat cushion in stress resistant expanded polyurethane. Fixed cover in polyester fibre and polyamide; removable upholstery cover available in a selection of fabrics in the collection. The backrest adapt to the body allowing for a particular support ease, thanks to its elastic internal structure. The modules in the compositions are joined together with a steel coupling system. The use of loose cushions is recommended.