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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 can help keep your mattress breathable, ideal if you're suffering from asthma or hay fever. The springs are independent of each other, reducing the "roll together" effect that can occur when using other mattresses. They can be made to your preferences by altering the number of springs and the gauge of wire. Enhanced Pressure Relief Unlike conve