Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointed

I would have liked to know the density of the padding: Example: 1 through 5 - soft, medium, firm, extra firm, etc. The padding is on the soft side; it gave me some lower back pain, even on a semi firm surface. Also the mat could be a little wider and a little longer. I returned the item mainly because of the back pain. I wish amazon would look for a mat that is say 2 1/2 to 3 feet wide and 6 feet long with some firmness.