【Head Stability Support and Spinal Alignment Adjustment with Central Concave Structure】 This product adopts a central concave structure that gently cradles the head. This indentation naturally fixes the head position, preventing unnecessary head movement during sleep. As a result, unnecessary strain on the neck and shoulders is reduced, supporting the maintenance of ideal spinal alignment from the head to the neck and lower back during sleep. This design is especially recommended for those who feel fatigue in their back and lower back during the day, such as from desk work, or those who feel neck pain upon waking up. It provides stable and relaxing support, just like receiving a correction from a chiropractor. 【Unique ARC Curve Design Perfectly Fits from Neck to Shoulders】 Based on ergonomics, the "ARC curve" has been adopted, thoroughly researching the natural curve of the neck. This curve is designed to closely follow the transition from the base of the neck to the shoulders, filling any gaps. This distributes the load on the cervical spine, significantly reducing the burden on the neck during sleep. Experience the ultimate fit, free from the sensation of the neck hanging or being compressed. This is a core function that we especially recommend to customers with shoulder and neck problems. 【Dual-Sided Elevated Design Considering Both Side and Back Sleeping】 The sides of the pillow are designed higher than the center. When sleeping on your side, the head is kept at the appropriate height, reducing pressure on the shoulders and arms. Furthermore, this elevated area guides your body into a natural supine posture without strain, supporting the correction to an ideal sleeping posture. It promotes smooth turning over, rather than remaining in the same position all night, and has multiple effects of reducing the burden on a single point of the body. This design is also satisfactory for those who cannot maintain a stable sleeping posture and frequently toss and turn. 【Easily Adjustable to Your Preferred Height】 This product has a height of approximately 9cm/approximately 14cm, and the height of the pillow can be easily adjusted. 【Sold by a Japanese Company】 Pillow, Neck Pain Relief, Ergonomic Design, Sleep Pillow, Low-Rebound Pillow, Good Sleep, Comfortable Sleep Pillow, High, Side Sleeping, Comfortable Sleep Pillow, pillow, Three-Dimensional Structure, Firm, Washable Pillowcase, Birthday/Christmas Present