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Mattress Double Firm - What's the Best Firmness for a Mattress? Firm mattresses are great for stomach and back sleepers. They also relieve pressure on hips and shoulders for those who sleep on their sides. This mattress double firm has a poly foam layer that offers shape and support as well as a soft, comfortable layer for slight pressure relief. Professional reviews note that the layers of this mattress are able to block motion which makes it a great choice for couples who tend to toss and turn in the evening. Firmness There isn't a universal answe