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- What's the Best Firmness for a Mattress? Firm mattresses are great for stomach and back sleepers. They also relieve the pressure on shoulders, hips and shoulders for side-sleepers. The mattress double firm comes with an outer layer of poly foam that gives shape and support, and an incredibly soft and comfortable layer for slight pressure relief. This mattress is praised by professionals for its ability to isolate motion. It's an excellent choice for couples that toss and turn at night. Firmness T