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Double Mattress Pocket Spring Pocket-sprung mattresses are made up of layers of natural fillings, such as cotton, wool and horsehair. These materials are sustainable and aid in keeping your mattress breathable, perfect for those suffering from asthma or hay fever. The springs are separate from each other, reducing the "roll together" effect that is common when using other mattresses. You can modify them to meet your needs by adjusting the spring count and the wire gauge. Enhanced Pressure Relief Pocket springs are different from conventional m