Having the right pillow for your head and neck can make a big difference with your cervical spine health. Your head weighs 4.5-5.5 kgs. Pillows wear out from the constant daily use of them. They need to be replaced every 2-3 years. No matter what the pillow is made of, the material breaks down and needs to be replaced periodically. A good pillow should support the head and neck so that the head is level and in alignment with the body. Too big of a pillow causes the head to now not be neutral. Too soft of a pillow gives little support to the neck. Pillows that work best are made from foam or polyfill. Feather pillows give very little support and lose their shape and support after the head is on them for a short period of time. The best sleeping position is on your back or side, not the stomach. You want the neck supported with the head neutral and in line with the rest of the body.