The hybrid system: A combination of both sofa mechanisms, this entails pulling, folding, or sliding a frame out to transform the sofa into a mattress. As an example, the bottom of the Post Nordby Pep Sofa Mattress slides out and even more cushions lift to create the sofa mattress surface https://andersonuphzp.worldblogged.com/36946390/the-basic-principles-of-canopy-for-beds