HIGH DENSITY FOAM: Made of 40D high-density sponge, which has strong hardness, high rebound and high durability to better repair sofa sagging. EASY TO USE: No complicated installation, just place the sofa support cushion on the bottom of the sunken sofa cushion to provide support to the sofa cushio. WIDELY APPLICABLE: Size-20 x 20 x 2 inches for chairs, sofas, or other furniture with removable cushions. It can provide stable support for a long time, extend the service life of the sofa and restore comfort. REPAIR SAGGING SOFA: The curved couch support cushion can effectively repair the sagging of the sofa caused by long-term use and restore the original support of the sofa. IMPROVE COMFORT: The arch design has good anti-deformation and compression resistance, effectively repairs sagging, and improves the comfort and support of the sofa, making sitting on the sofa more comfortable.