Finally a solution to the uncomfortable sofa bed mattress. This mattress will fold into your sofa the same way as a coil mattress does but will return to its original shape every time you reopen it. Guaranteed not to feel the bars.
Choose from memory foam or high density foam sofa mattress replacement.
How to Measure Your New Sofa Bed Mattress.
You should measure the frame, not the mattress.
You shouldn't worry about rounded corners, the mattress also has rounded corners.
Measure the frame inside, and round down to the next inch. For example, 68-3/4 would become 68.