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The Benefits of a Pocket Spring Double Mattress A double mattress that is pocket-sprung features individually encased springs each one shaped to your body's contours to provide precise support. They also reduce motion transfer when sharing the bed. The number of springs - ranging from 1000 to 2000 per kingsize - isn't as important as the spring tension and the natural fillings which house them. Comfort A pocket-sprung mattress is made up of hundreds, or even thousands, of tiny springs enclosed in