On this page you will find the sofa beds with the functional mechanism. The sofa beds with this system generally take up the least space in terms of width. The seat cushions are also used as a mattress. No extra space is therefore lost on a mechanism. With the functional system we assume that both the sofa and the bed will not be used on a daily basis. It may of course be the case that you would like to opt for a sofa that folds out in the same way, but is qualitatively in a higher segment. You can get there by clicking on it here Comfort System, Comfort Plus System if it Royal System.