SEVEN FIRMNESS ZONES -Ergonomically designed for correct support and uncompromising comfort. -Softer upper back and pelvic areas offer pressure point relief and spinal alignment. -Firmer lumbar area supports spine to relieve tension and lower back pain. PRESSURE RELAXATION CHANNELS™ -Provides flexibility, pressure point relief and spinal alignment when side sleeping. SPECIAL "PIN CORE" CONSTRUCTION -Enables ventilation of body heat. Natural Latex Core Harvested from the Rubber Tree -Hypoallergenic, hygienic, anti-bacterial and dust mite resistant. NO MATTRESS SPRINGS -Motionless comfort for side-by-side sleepers. RETAINS FIRMNESS LEVELS REGARDLESS OF ROOM TEMPERATURE (unlike temperature sensitive foam mattresses) -Reliable support and softness; mattress conforms to body contour immediately. INDEPENDENT SUPPORT FOR TWO PEOPLE OF VARYING WEIGHTS -Maintains a level sleeping surface and less roll-together feel. SYMMETRICALLY DESIGNED -Zones are consistent when mattress is rotated head to foot or top to bottom. DESIGNED FOR ALL HEIGHTS -The length of a person's torso, regardless of their height, is very similar; height is generally determined by the length of the legs.