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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 could help stop sagging, which could cause back pain. They also distribute the weight evenly, reducing pressure to muscles and joints. A bed that is firm is usually recommended for stomach and back sleepers or people with a larger build. It isn't ideal for those who sleep on their sides. Comfort The be