Amazon List Price: ¥4999 【Stable Head 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 and prevents 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 back or lower back fatigue 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 correction from a chiropractor. 【Unique ARC Curve Design for a Perfect Fit 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 and significantly reduces the burden on the neck during sleep. Experience the ultimate fit, free from the sensation of the neck hanging or the discomfort of being compressed. This core function is highly recommended for customers with shoulder and neck problems. 【Higher Design on Both Sides Considering Both Side and Back Sleeping】 The sides of the pillow are designed to be 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 higher area guides your body into a natural supine posture without strain, supporting the correction to an ideal sleeping posture. It promotes smooth tossing and turning throughout the night, preventing you from staying in the same position and reducing the burden on any one part of your body. This design is also satisfactory for those who cannot maintain a stable sleeping posture and frequently toss and turn. 【Easy Height Adjustment to Your Preference】 This product has a height of approximately 9cm/approximately 14cm, and the height of the pillow can be easily adjusted. You can adjust it to your body size and preferred sleeping posture. 【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