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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 ease pressure on hips and shoulders for side sleepers. This mattress is double firm and has a poly-foam layer that provides shape and support as well as a comfortable layer to ease pressure. The mattress is highly praised by experts for its ability to isolate motion. It's a good choice for couples that toss and turn