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The Benefits of a Pocket Spring Double Mattress A double mattress that is pocket-sprung has springs individually encased each one shaped to your body's form to provide a precise and secure support. They also limit motion transfer when sharing the bed. The number of springs (from 1000 to 2000 per Kingsize) is not as important as the tension of springs and natural fillings. Comfort A pocket-sprung mattress is composed of hundreds or thousands of tiny springs that are wrapped inside pockets of fabric. let