Size Details : Our sofa cushion support measures 50×50×5 cm , suitable for most family sofas , and you can also cut it by yourself for adaptation Soft High Density Foam : Our sofa seat support is made from high density foam that stays soft yet supportive for long term use Trapezoidal Design : The trapezoidal design is more reasonable , because more people like to sit in the middle of the sofa . Compared with the arc design , the trapezoidal design makes the sofa cushion more stable and more fit with the sofa cushion Effortless Installation : Slide under sofa cushions or custom cut to fit , offers robust support without complex setup Widely Uses : Specially designed for sagging sofas . Not only suitable for family sofas , but also for most sagging sofa cushions to make the sofa soft again