We bought this too replace our almost non-existent sofa bed mattress & this thing is super comfy. The bottom layer is made up of springs and the top is filled w/ air. If guests don't care for too it to be too firm, then we just don't fill it as full w/ air. Another great thing about it is that we can leave the air out and we're still able to fold it up in to the sofa while still able to use sofa. It also comes with the pump!! this was a magnificent purchase!!!
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