I used it once, but the neck height didn't suit me, so I'm putting it up for sale. This is a new concept pillow designed to support natural sleep, based on advice from a dentist that "maintaining proper sleeping posture and regulating temperature and ventilation within the bed is crucial for obtaining high-quality sleep." It has a shape that helps maintain a sleeping posture that reduces tension, and uses materials that are not prone to trapping heat and allow for easy turning over. It takes a "before-sleep relaxation" approach, and the pillow has a 2-way design. Please use it after relaxing before bed! The height, angle, and firmness of the pillow were repeatedly adjusted by a doctor to create a shape that supports natural sleep. It can also be expected to have the effect of restoring your natural face by simply reducing unnecessary tension! The filling uses a new material called "E-CORE," a three-dimensionally combined network of thread-like polyethylene resin. Compared to conventional urethane foam, it offers superior heat dissipation and excellent breathability, allowing for comfortable use throughout the year! For comfortable sleep, we also paid attention to the pillow cover, using a skin-friendly cover with a good feel that does not compromise the breathability and heat dissipation of the filling!