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Double Mattress Pocket Spring Pocket sprung mattresses feature layers of natural fillings, such as wool, cotton and horsehair. These materials are eco-friendly and aid in keeping your mattress breathable, ideal for those suffering from asthma or hay fever. The springs work independently of each other, thus reducing the 'roll-together' effect that can be seen in other types of mattresses. You can adjust them to suit your preferences by altering the spring count and wire gauge. Enhanced Pressure Relief Contrary to convention