Is this plush memory foam mattress bad for your back?

It depends on your weight and position. Spinal support rates a candid 5.2/10 because a plush 3/10 surface lets the hips settle deep, so lighter sleepers float in alignment while heavier sleepers and stomach sleepers can sink too far for neutral support. If you need firm hip-lift to keep the spine flat, choose a firmer model. The 365-night trial lets you confirm it works for your back.

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