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A Firm Double Mattress Balances Comfort and Support A firm double mattress balances comfort and support. It's great for back sleepers. Firmer mattresses can help prevent sagging, which can cause back pain. They also help to distribute weight evenly and reduce the pressure on joints and muscles. For stomach and back sleepers, or those who have a larger body, a bed that is firm is highly recommended. It is uncomfortable for people who sleep on their backs. Comfort The best mattress can be the dif