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- The "world's firmest" mattress in a box...
The "world's firmest" mattress in a box...
Just how firm is it?
If you have back pain, you need a firm mattress.
But how firm is too firm?
We tested out the Plank Firm, a mattress that’s been called “the world’s firmest mattress in a box” to see if it’s worth buying or if it’s a brand you should pass on…
Until next time,
Rob from Sleepline