Love it! Flexible
I have a very expensive Biomat which I have used a lot sitting on it and like it, but it IS quite stiff and barely bends enough to fit the curve of my neck. The Philemon mat, looks and seems similar, has amethyst et al, for a much better price. I love that it contours nicely around body parts - my neck, shoulder. It works great for me.  Luckily I got it for a great price, and may buy another eventually.
Rating: 5 stars