High Density Foam: Soft chair square cushion support made of 45D high-density foam gives high rebound and high durability that improve the support of the sofa cushion well and reduces pain Long Lasting Support: Our couch cushion support isn't just sturdy, it's a long-term ally. Unlike flimsy sofa cushion support, ours fights sagging for years, making "replacements" a forgotten chore Curved Design: The sofa cushion support for sagging seat has better resistance to deformation and compression, and with its curved design, can improve the comfort and support of your sofa Easy to Install: No tools, no wait. Just slip this couch supports for sagging cushions under your cushion in seconds and watch saggy seats fade away Versatile Use: Works as cushion supports for sagging cushions in couches, recliners, loveseats, RVs, and more. Also functions as sofa boards for sagging couch or under-seat panels