The heart of the catalina mattress is the 5 inch firm 125 gauge supercoil framed spring unit coupled with a 30mm layer of heat sensitive memory foam that moulds itself to your body contours to give extra pressure relive the wavy line pattern of the multi quilted soft white knitted panel fabric on the sleeping surface blends perfectly with the pattern on the colour contrasting mattress border to create a wonderful balance this mattress is designed without the need to turn however we do