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Double Mattress Pocket Spring Pocket sprung mattresses are filled with natural materials, such as horsehair, cotton and wool. These materials are durable and help keep your mattress breathable. Ideal if you suffer from asthma, hay fever or allergies. The springs work independently of each other, reducing the 'roll together' effect that can occur in other mattresses. They can be customized to your preferences by altering the number of springs and the wire gauge. Enhanced Pressure