I really couldn’t decide between this bolster and the amethyst one. I started with the amethyst bolster. I am an acupuncturist and I already use the full mat on my table. I treat many patients for neck pain, and I thought these bolsters would take the treatments to the next level. I was right! I ended up with both. I let my patients try each one. One goes for the neck, the other goes under the knees. Either way, you can’t go wrong! They both feel great each in their own way. I find most people like the heat around 120-130. The pebbles feel great in the neck. They also feel good behind the knees. There is an acupuncture point behind the knee for low back pain, and I feel the pebbles target this point from the aspect as well. Highly recommend!