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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 strong and keep your mattress cool and breathable. It is ideal if you suffer from asthma, hayfever or allergies. The springs are independent of each other, reducing the "roll together" effect that is common when using other mattresses. You can customize them to suit your preferences by adjusting the spring count and the wire gauge. Enhanced Pre