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A Firm Double Mattress Balances Comfort and Support Double mattresses that are firm give both comfort and support. It's ideal for those who sleep on their backs. Firmer mattresses can help to prevent the risk of sagging, which can cause back pain. They also distribute the weight evenly, reducing pressure to joints and muscles. A firm mattress is typically suggested for stomach and back sleepers as well as those who have a larger body. It can be uncomfortable for those who sleep