It is very comfortable.  Soft but firm.  It has helped my back enormously.
Update











I purchased this item a couple of months ago in the hopes that it would improve my back pain in the morning. I was very happy that it did. I still had some pain but much less. I don't know when it changed but I realized earlier this week that I no longer had any pain in the morning at all. This is definitely on of the best purchases I have ever made