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The Benefits of a Pocket Spring Double Mattress A pocket sprung double mattress is made up of springs that are individually enclosed that are each individually shaped to your body's form to provide precise support. They also limit the amount of motion transfer between bed partners. The number of springs, which ranges from 1000 to 2000 per kingsize - isn't as important as the spring tension and the natural fillings that house them. Comfort A pocket-sprung mattress is