This is a pneumatic neck stretcher. It has a structure that gently stretches the neck by inflating it with air, making it suitable for refreshing and stretching the neck area. It's a 3-in-1 type that allows you to adjust the height and stretch to your liking by adjusting the amount of air. After use, you can deflate it and fold it compactly, making it convenient for travel, business trips, use in the car, or at home. The cover is washable, so you can keep it clean.