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 ...

The aptly named Serpentine sofa from Anthropologie is 98 inches long and made of kiln-dried hardwood, foam, and velvet. It comes in three ready-to-ship colors, or you can customize the sofa (which ...