The mat's knobbies on the bottom are just right but it didn't flatten out all the way yet. I have had it a week. Took 2 days just to get the thing to unroll and then I had to point a heater at it. Maybe this summer it will finish flattening....
I purposely waited over a year to review this product in order to determine how it stood up to daily use. Some plastics will break down and crack. I'm happy to say this product shows no signs of wear and tear yet. No cracking.
Excellent job by staples delivery was next day and the driver rang the front door bell for delivery. Social distancing was practiced no physic contact items placed at front door. The mats are on the thin side compared to the units being replaced but for the price they should last a while. The old ones were all cracked and starting to break apart. These might not be good for deep pile as the chair does tend to sink in a little on regular carpet.