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Mattress Double Firm - What's the Best Firmness for a Mattress? Firm mattresses give a solid feeling that's perfect for stomach and back sleepers. They also help relieve pressure on hips and shoulders for those who sleep sideways. This double firm mattress features a poly-foam layer that provides shape as well as support, and a comfortable layer to ease pressure. Professional reviews indicate that the layers of this mattress isolate motion which makes it a great option for couples who tend to toss and turn in the evening. Firmness There is no one-size-fits-all an