The Hypnos Canterbury is a pocket sprung pillow top no turn mattress. It has a ReActive™ 8-turn pocket spring system for postural support, 3 rows of hand side stitching for edge-to-edge support, 37.5® technology that actively regulates temperature and moisture, luxurious layers of Solotex™ wool and natural latex for supreme comfort, Adaptiv™ springs in the pillow top that sense and flex to the body shape all encased in a chemical free sleeping surface.