Middot open coil spring unit with double heat treated springs to retain shape and height middot available in firm or standard tensions middot rod edged for longevity and edge to edge support middot multilayer luxury upholstery laid over flexible spring insulator middot hand tufted with felt collars middot padded and machine fluted borders middot flag stitched handles middot suitable for use on dreamworks beds bedsteads middot this zip link mattress is made of 2x2ft 6quot ma