How firm is it, and will it help with back support?

It is a genuinely firm mattress, roughly 7 to 8 on the firmness scale, built on a 6-inch high-density soy-based support core. That firm core keeps the spine from bowing, which is why back and stomach sleepers tend to feel well supported on it. The gel memory foam on top still relieves pressure so the firmness does not feel harsh. There is a short break-in period as the foam settles to your body.

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