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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 pressure on hips, shoulders and shoulders for side-sleepers. This double firm mattress features an elastomer layer that offers shape, support and a soft comforting layer to relieve pressure. is praised by experts for its ability to isolate motion. It's a good option for couples who toss and toss during the night. Firmness There's no one size fits all answer to the q