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Double Mattress Pocket Spring Pocket-sprung mattresses are filled with natural materials such as wool, cotton and horsehair. These materials are strong and keep your mattress cool and breathable. They are ideal for those suffering from asthma, hay fever or allergies. The springs operate independently from each other, reducing the 'roll-together' effect that is common in other types of mattresses. You can modify the springs to your preference by altering the spring count and the gauge of