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Measuring 54" x 75", a full box spring is a mattress foundation that both reinforces your mattress and lifts your mattress off the floor. A box spring full size bed base is a nest of springs rimmed with wood or plastic and covered with cloth. This unique construction is what makes a full size bed foundation stable and supportive. By pairing a full mattress box spring with your full bed, you will experience an even better night's rest.