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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 reduce motion transfer when sharing the bed. The number of springs (from 1000 to 2000 per Kingsize) is not as important as spring tension and natural fillings. Comfort A pocket-sprung mattress is composed of hundreds or thousands of tiny springs wrapped inside pockets of fabric. Each spring can work