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