BILLIE IS A FABRIC SOFA, ALSO AVAILABLE IN LEATHER OR ECO-LEATHER. BILLIE HAS A SINGLE LARGE SEAT CUSHION, WITH A HIDDEN ALUMINIUM FOOT, AND IS AVAILABLE IN TWO SEAT DEPTHS: 90 OR 105 CM. BACKRESTS AND ARMRESTS STRUCTURE MADE OF SOLID WOOD AND PLYWOOD COVERED WITH VARIABLE DENSITY POLYURETHANE FOAM. SEAT CUSHIONS IN NON-DEFORMABLE, HIGH-RESILIENCE, AND VARIABLE DENSITY POLYURETHANE FOAM. THEY REST ON HIGH RUBBER CONTENT ELASTIC WEBBING INSERTED IN THE ALUMINIUM FRAME. BACK CUSHIONS IN HIGH RESILIENCE, VARIABLE DENSITY POLYURETHANE FOAM. TO FACILITATE REMOVAL OF THE COVERS, THE ARMRESTS AND BACKRESTS CAN BE REMOVED FROM THE FRAME BY MEANS OF A QUICK COUPLING AND RELEASE SYSTEM.