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Mattress Double Firm - What's the Best Firmness for a Mattress? Firm mattresses are perfect for stomach and back sleepers. They also help relieve the pressure on shoulders and hips for side sleepers. This mattress is double firm and has an elastomer layer that offers shape as well as support, and a cushion to ease pressure. Expert reviews have noted that the layers of this mattress block motion, making it a great option for couples who tend to turn and toss throughout the night. F