Should you get a pillow that is firm or should you get a softer one. Most people prefer something right in the middle. The Linear gravity family of pillows fits in this category of medium firmness. This includes the small, medium, and large gravity pillows as well as the traction pillow. It is also known as the Cervical Linear Traction Pillow because opposite the traction side is the side with the neck roll only; the linear gravity medium side.