I purchased this pillow, but after using it for about a week, I found another pillow that suited me better, so I am selling this one. I used it for about 3 days after purchase and then stored it in a closet for several months. Please purchase only if you understand that this is a used item. The "True Sleeper Seventh Pillow Ultra Fit" has 12 slits and an Ultra Fit Cut structure, which improves the fit for side sleeping compared to the previous model. It is designed to support seven parts of your body, from your head to your back. It's a large size that envelops you, making your neck, shoulders, and back feel relaxed. One of the reasons for feeling strain on the neck and shoulders when waking up or during sleep is thought to be the "pillow." A pillow that doesn't fit can create a gap between the head and neck, failing to support the neck and concentrating pressure on the head and both shoulders, leading to strain on the neck and shoulders during sleep. The Seventh Pillow supports seven areas: the head, neck, both shoulders, both arms, and back, distributing pressure and reducing that strain. Also, since the position of the shoulders and the height of the neck differ between back sleeping and side sleeping, it's necessary to cover both, which is quite difficult. The Ultra Fit has slits, so the way it sinks in changes between back sleeping and side sleeping, allowing it to accommodate the differences in shoulder position and neck height. Furthermore, because the pillow itself has a large surface area, it is thought to be compatible with various sleeping positions. From the above, the Ultra Fit reduces the strain on the neck and shoulders during sleep and can cover both back sleeping and side sleeping, making it one of the ideal pillows. - Brand: True Sleeper - Model Name: Seventh Pillow Ultra Fit Single - Features: Design that supports shoulders, neck, and back - Material: Breathable mesh material Shipping will be done in the same way as when it was new, folded and compressed for delivery.