Turns out I did not need it. Good enough, though.

Like the rubber no-slip on bottom. Well made.

Exactly right. Good value and fast delivery

Great pad, doesn't move and has a really nice resistance to it. Stays put and adds cushion and comfort to the rug

The pad looks like it will be a good surface under my new rug. However, the size was slightly off (a couple inches larger in both dimensions) than the stated size, so it required that I cut it to the correct size before I was able to use it. It was not easy to cut. I would have preferred a correctly sized pad.