MANY PEOPLE HAVE COMPLAINED OF ODOR WHEN UN BOXED. IT WAS SO SLIGHT I REALLY DIDN'T NOTICE. HAVE A VERY BAD BACK , THIS MATTRESS IS QUITE COMFORTABLE. LOTS OF ARTHRITIS , ALWAYS HAD DIFFICULTY GETTING OUT OF BED BEFORE NOT SO ANYMORE. DON'T EVEN NOTICE WHEN MY 125 LB DOG GETS UP AND CHANGES POSITION; MY 2 CATS LIKE IT TOO!