Couch cushion support is developped to improve sagging sofa seats so they become supportive as new. Our cushions are measured 19.7"x19.7"/ 23.6"x23.6"/ 27.5"x27.5" with a thickness of 2 inches in the middle and 1.25 inches on the edge. This sofa cushion support for sagging seats applies high density foam,which is not easy to deform after sitting for a long time. it can effectively hold up sagging seats of sofas, armchairs, series chairs and couches. As a under couch cushion support, our foam cushion comes in a sleek and subtle black/white color that blends seamlessly with any type of couch and sofa, making it virtually invisible, keeping your couch's aesthetic appearance consistent. Simply insert the couch cushion support with CURVED SIDE UP between your sagging couch and frame, and you're done! Designed specifically to fix sagging couch cushions, couch cushion support may also work as furniture cushion replacement for other furniture like chairs or loveseats, as long as they have similar sagging cushion issues.