The product description said this product would be fine with pile carpets. It is not stiff enough - so the chair creates dents in the mat. They are not permanent but with a rolling chair you are constantly stuck in the valleys that it creates.
I already did a review on this obviously it was lost in your system. For the price it’s a good value for at home offices I suggest however tomhave one similiar with longer studs on bottom to better support thru standard carpet with regular pile