RespaTech Ortho spring system 12.5 gauge offering medium – firm support with an edge to edge support frame included. Extra comfort layers for a cushioned supportive firm feel. Ideal for keeping spinal alignment and correct posture while sleeping. 3D Airflow Technology along with side air vents makes this mattress highly breathable by maximizing airflow. Turning is recommended for this mattress which is 29cm in height and finished in a plush knitted soft touch fabric for extra comfort.