Very thin. It's week 4 and it still hasn't laid flat. I have rolled over it with numerous heavy things to flatten and it still is crinkly. I even tried spraying water and shuffling my feet up and down it then tucking one side of edges under the heavy couch. I just wish it was thicker and had a bit of grip underneath. Other than being really cheap, it looks nice.
Sigh. Maybe it'll lay down one day.