M-Sofa - DIOTTI A&F Italian Furniture and Interior Design
Marlow Sofa - Wittmann
Cara - Gruenbeck interior design
Amazon.com: BEN'SHOME® Upgraded Couch Cushion Support [19.7x58-67"] - Sofa Cushion Support for Sagging Seat, Strong Couch Supports for Sagging Cushions, Couch Support to fix Your Living Room Sofa | 0.4" Thick :