An example of filling that is used in the sofa will be the foam. The foam upholstery will definitely have that firm and supportive feel and this also lends more tailored appearance to the sofa. The foam upholstery is also helpful since this kind of construction and design can recover well and all you need to do is to just turn the cushions every other time to even the wear of the sofa. Do remember that after some time, the sofa will also compact and it will lose its volume but at least the process will be slower.