Restore comfort and support to sagging couch seats quickly and simply with these density trapezoid cushion inserts. Designed to fit under seat cushions, the 40D foam blocks lift and stabilize worn seating areas so your sofa feels firmer and more comfortable without reupholstering. Key benefits Fixes sagging seats: provides immediate support under soft or collapsed cushions to eliminate dips and uneven seating. Restores comfort and appearance: raises seating surface and evens cushion support so cushions sit and perform like . Longlasting support: made from 40D density foam for firm, durable performance under regular use. Easy, notools installation: slide the trapezoid support under the cushion—no removal, adhesives, or repairs required. Product highlights Shape: Trapezoid wedge profile designed to fit under cushions and stay in place. Density: 40D density foam for firm, supportive performance. Size: 20' x 20' (fits most standard square seat cushions). Quantity: Pack of 2 supports included. Function: Furniture seat sagging for sofas, loveseats, sectionals, and other upholstered seating. How it works Place the trapezoid support between the seat base and the cushion, positioning the wider side where you need the most lift. The wedge shape fills the void created by worn springs or compressed foam, redistributing weight and restoring seating height and shape. Because it sits under the cushion, the is discreet and reversible. Compatibility and use Fits most sofas, sectionals and loveseats with removable or liftable seat cushions approximately 20' x 20'. Works with a variety of upholstery types and cushion constructions—use it under foam, down, or fiber cushions to add support. Ideal for homes, apartments, vacation rentals, or staging where a quick, costeffective seating is needed. Specific use cases a sagging living room sofa: slide one or both trapezoid supports under sunken cushions to restore an even seating surface and comfortable back support. Improve a sectional or loveseat: place supports under frequently used seats to reduce bottoming out and make shared seating more comfortable. Prepare furniture for guests or staging: quickly firm up worn seats in rental properties, Airbnb units, or for home showings without reupholstery. Practical notes Measure your cushion footprint before installing to ensure a 20' x 20' support is appropriate. Position and adjust the wedge under the cushion to find the balance of lift and comfort. For results with deeply sagging furniture, combine these supports with other cushion maintenance such as rotating or replacing cushion foam. This 2pack of 20' x 20' trapezoid 40D sofa cushion supports offers a simple, effective, and durable way to sagging couch seats and extend the usable life of your furniture.