I did a lot of research before buying this wool pillow in medium firmness as it is the recommended firmness for side sleepers. I have tried every pillow on the market trying to get comfortable support for a neck injury sustained in a car accident. The first two nights the Eco-Valley pillow gave perfect support. However, the third night I was disturbed by lumpiness which gradually became worse each night in addition to the entire loft of the pillow going flat. It is barely comfortable as a side pillow. Really disappointing, especially considering the cost ($** for a King size). Maybe this is typical for all wool but maybe I got some kind of defective pillow?? I have no idea but will probably not make the investment in a different brand to find out after this experience.