Is a soft mattress like this bad for your back?

Not this one, because the softness sits on a serious support core. While the surface is plush (4 out of 10), underneath is Sealy's zoned Posture Grid coil system with a firmer reinforced lumbar band, giving a 7.8 out of 10 spinal-support score. So your hips and shoulders get deep cushioning without the spine collapsing into a hammock, the failure mode that gives soft beds a bad name.

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