Summary: the construction of the whole thing, think of a thin sleeping bag with fabric about as thick as a sheet, with a bunch of stuff crammed into it. That is the construction of the whole mattress. Here is the mattress sock unfolded and unzipped. I broke one of the zippers on the mattress sock by the way on the final zip, but the bed still works fine. When I get around to it I need to
Image Dimensions: 500 x 375
Image originally found here.