I have been using this pillow for 2 weeks, long enough to feel the results. Purchased this on recommendation from a friend to alleviate neck pain. It has worked for me, I believe because of the very dense support, yet it molds and conforms to your neck and head. It is quite costly, the only drawback, but I decided to take a chance. Glad I did. It is also quite heavy which might be of concern to some. measure carefully, it is long. It is pictured in a standard size king pillowcase, fits nicely. The pillow had a slight odor, I placed it outside in the sun and odor dissipated in a few hours. Quite happy!