Couch topper recommendation

Hi about a while I have to sleep on a couch and I want a bed like experience so I want to ask for topper recommendations. Here are the details: The first thing is the couch, it is 80x180 so most classic sizes like 200 or 190 are not working for me and the second thing is I'm 100 kg and I'm a side sleeper so I think the topper mattress should be firm. And finally, it must be foldable. If you have any suitable suggestions, things you use, etc., I would be happy to hear them.