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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 reduce the sagging that can cause back pain. They also help distribute weight evenly, which reduces pressure on joints and muscles. For back and stomach sleepers, or those who have a larger build, a firm bed is highly recommended. However, it can be uncomfortable for side sleepers. Comfort The right mattress can make all the difference between a restful night