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Mattress Double Firm - What's the Best Firmness for a Mattress? Firm mattresses are ideal for stomach and back sleepers. relieve the pressure on shoulders, hips and shoulders for side-sleepers. This mattress double firm has the poly foam layer which provides shape and support and an incredibly soft and comfortable layer that provides a little pressure relief. This mattress is praised by experts for its ability to stifle motion. It's a good ch