For those who have been searching for a pillow that does not cause neck pain, this is the pillow for you. I have spend years and lots of money looking for a pillow that would not cause me neck pain in the morning. Adjusting the water level inside the pillow to your comfort level is a God sent. First day I tried the pillow, I filled the water level to firm. That didn't work for me. On the second day, I took out half of the water, and the next morning, no neck pain. Anyone suffering from neck pain should buy this pillow. Thanks to the inventor and to CDW!