I need a sofa bed mattress 130x 180 x11. I bought the pocket sprung from the sofabedgallery but it is soft and floppy. I counted the springs along the edges and it seems there are only 638 (29 x 22), not the 1088 advertised. Can you please advise me where to get a good quality mattress that can fold once?

Regards, Rebekah. .