I recently replaced my pillow from core that I had for 10 years. It was the most amazing pillow the firmness stayed all that time held up to being washed constantly and I finally decided I should probably get a new one and threw out the old one before the new one came. I'm so upset that I did that the new one is nothing like their old version. It is not firm, it is floppy, doesn't hold up and there is a total difference. I've read other reviews where others have mentioned this as well and I have to agree. Then the company comments on their post that they haven't changed a thing. Obviously something is different or the pillows would feel the same. Since I spent so much on the pillow I tried it for over a year to see if I just needed to get used to it but no it caused my terrible headaches and neck aches to return. Now I'm going to have to research a new pillow brand to support my neck that is a much much better quality than this one is! Don't buy it!