A contoured, three-dimensional form for more ideal sleep. It enhances the fit when sleeping on your back and features thicker sides to allow for smooth transitions to side sleeping. This pillow excels in neck stability, achieving the best sleeping posture. This ergonomic design pillow focuses on the change in neck height between back and side sleeping. It fits very well and is easy to use, accommodating tossing and turning. I used a cover, so I think the condition is also good.