The hybrid mechanism: A mix of each sofa mechanisms, this includes pulling, folding, or sliding a frame out to convert the sofa into a mattress. As an example, the bottom from the Posting Nordby Pep Sofa Mattress slides out and even more cushions carry to create the sofa mattress area. https://kitchen-chairs-table39442.blogsumer.com/30497142/not-known-details-about-king-beds-with-upholstered-headboards