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Double Mattress Pocket Spring Pocket sprung mattresses have layers of natural fillings like wool, cotton and horsehair. These materials are eco-friendly and aid in keeping your mattress cool, which is ideal if you're suffering from hay fever or asthma. The springs function independently of each other, thus reducing the "roll together" effect that is common in other mattresses. They can be made to your preferences by altering the number of springs and the gauge of wire. Enhanced Pressure Relief Pocket spring