Metal pull-out mattresses are typically thinner, between 3.5 and 5 inches, since they have to be folded into thirds to fit in the sofa’s frame. These can contain springs, memory foam ...
A sleeper-sofa mattress upgrade: Milliard 4.5-inch Memory Foam Replacement Mattress It doesn’t take much to improve upon the busted, old mattress—or the disappointing new one—lurking in your ...
and slept on each sleeper sofa one night per week for four weeks. Overall, we found that the most comfortable sofas are firm yet plush, with memory foam mattresses that don’t sink or sag.