Check the listing for details. 20" x 20" 3PCS Couch Cushion Support for Sagging Seat Curve Sofa Cushion Support. Condition: New. Listed at 19.80 USD. Sofa Cushion Support: The arched cushion support foam provides a perfect solution for repairing sagging cushion. Make your sofa more supportive and improve the comfort of the seat cushion. High Density Foam: Our Couch Sag Repair Replacement is made of 35D high density foam, which is not easy to deform after sitting for a long time and repairs and prevents sagging effectively. Easy Installation: Simply put the couch cushion support under your old cushion with the curved side up. An anti-slip cloth is included to ensure that your sofa cushion stays in place. Wide Application: Measuring 20 x 20 x 2 inches, the cushion support pad is designed to repair sagging cushions of sofas, couches, sectional sofas, loveseats, and recliners. It can also be cut to suit your needs.