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A Firm Double Mattress Balances Comfort and Support A double mattress that is firm balances comfort and support. It's perfect for back sleepers. Firmer mattresses can help prevent sagging, which can cause back pain. They also distribute weight evenly and reduce pressure on joints and muscles. A firm mattress is typically suggested for stomach and back sleepers as well as those who have a larger body. It isn't ideal for those who sleep on their backs. Comfort can be the difference betw