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Foam mattress promising to be extra firm. It arrived in a convenient little roll, but 6 months later, it is absolute shit. Fell for the marketing and now my back is paying for it.
Try flipping it.
Oh I still love mine after 5 years. It's medium firm, so maybe an extra firm one wouldn't have held up as well.
With foam mattresses, you need to look at the density of the high-resilience foam (HR foam) that they use. Generally the higher it is, the firmer the mattress will be and less prone to sagging.
It also means it will be a lot heavier and difficult to move around. If the density info is not provided, you can just look for ones they claim are for people who are heavier than your own weight.
I bought a Douglas one and I've been incredibly happy with it. My sleep quality improved quite a bit, and almost 2 years later is still going well
Go hybrid
Which brand? My IKEA Morgedal (now superseded by some other name) has been incredible.