Floortex® Enhanced Polymer Rectangle Chair Mat Carpets 48" x 51"

It's very sturdy. It's a hard plastic type and not a vinyl type. It comes shipped flat and not rolled up. The only issue I have is that it does creep forward and I have to occasionally adjust and put it back into place.

This mat is great for carpet. I was worried about getting a thinner, more flexible mat, because I didn't want the wheels to make dents that I would have to struggle to roll out of. I looked at similar mats on Amazon, but they were much more expensive, and Walmart shipped this to my home, so it was just as convenient at a much better price. My only complaint is that I wish I had taken better measurements, because this mat is almost too big for the space in front of my desk. I ended up sliding part of it under the desk, and that worked fine.