Royal Sleep Products by The Futon Factory 8 Inch Twin Size Foam Futon Mattress - CertiPUR-US Certified, Made in USA - Solid Black Fabric (Frame Not Included) - Perfect for Guest Rooms, Dorms & Small Spaces

This came boxed in a vacuum-sealed plastic bag of sorts, and as soon as I began cutting through the wrapping, it began to "inflate," as promised on the packing slip. It is NOT lightweight or small. We bought the Full Size (Double) for our standard futon frame, and I must say, it is really thick and well-cushioned. As it was still expanding with the atmosphere, you could hear/feel the coil springs that are in the center of the materials. After it has had about 2-3 days of adjusting outside the packaging now, it is quite comfortable to lay on briefly. I'm not quite to the 72 hours of letting it "rest" and expand yet, so I haven't laid down on it for more than a few seconds. We also haven't tried to fold it into the seating position, but I have serious doubts that it will do so without a fight. It's almost too plush and thick for being used as a seat for too long - it seems more fit to be left as a bed. If so, it is likely going to be a very popular mattress for our guest bedroom, as it seems to be made for sleeping comfort vs. sitting around on. That's fine for our purposes, but be aware that it will fight you at first if you use it as a couch. It also has a bit of a new odor that the packaging states is normal for a while until it breathes more. It isn't obnoxious or off-putting, so we don't mind. It smells like new fabric/material of any kind. The cover is a nice color of blue (our selection) and soft to the touch - not scratchy. I think we will be very happy with this purchase. I'll update the review after we have some time spent sleeping/sitting on it after the break-in period is over.