This butterfly pillows are not just comfortable but also provides relief from backaches headaches neck issues and more Responding to your weight and body heat memory foam will adjusts to the pressure that your head and neck place on it it is the natural fresh smell from the memory foam and its not harmful The odor should dissipate within a few days and aired out Elastic strap and adjustable clip designed so you can adjust the height upward downward of your neckrest head support The memory foam construction and compact can be used at home office car travel