The price of this office mat was good and I needed three of them for our medical office. We opened the first one sat in a chair on it and it dented right away. I had to return all three and get thicker more expensive ones.
Despite it being advertised for a medium-thick carpet the spikes are not nearly enough sharp and long hence the mat keeps dancing around the carpet - which is highly aggravating. Not a good product for the high price they charge for it. Wouldn’t recommend it.