Abstract: A mattress comprising an interior core of inner pocket springs arranged in a plurality of columns extending between opposite ends of the mattress disposed within an exterior periphery of outer pocket springs arranged in a plurality of columns extending between opposite ends of the mattress and a plurality of rows extending between opposite sides of the mattress where each inner pocket spring and each outer pocket spring has substantially the same in pocket height and out of pocket height, and the outer pocket springs are firmer than the inner pocket springs to create a relatively firm border around the periphery of the mattress.