The hybrid system: A mix of equally sofa mechanisms, this involves pulling, folding, or sliding a frame out to convert the sofa into a mattress. For example, the bottom in the Post Nordby Pep Sofa Mattress slides out and more cushions raise to create the sofa mattress surface area. aware https://singlescruise45320.blogtov.com/11517173/what-does-queen-base-beds-mean