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Mattress Double Firm - What's the Best Firmness for a Mattress? Firm mattresses are great for back and stomach sleepers. They also relieve the pressure on shoulders, hips and shoulders for side sleepers. This mattress double firm features an outer layer of poly foam that provides shape and support and a soft, comforting layer that offers a slight relief from pressure. The mattress is highly praised by professionals for its ability to stifle motion. It's an excellent option for cou