BEDGEAR’s patented Air-X® technology keeps the air flowing in and around the pillow to help the body naturally regulate its temperature. The Air-X mesh and air vents provide cross-ventilation throughout the pillow, moving excess heat away from the head, neck, and shoulders. The lowest height pillow – 0.0 size – includes an Air-X mesh patch and air vent on top and bottom while the other three sizes include Air-X mesh and air vents on all four sides.