This chair mat was the only one available and is not nearly as substantial as one I purchased a few years age. The mat is on low pile carpet and Imprints from my desk chair are clearly visible. I do not recommend this mat.
I would not buy this product in the future. The plastic starts to indent where the wheels of your chair are and thus create molded indentations that the chair gravitates to. I needed a pad that would NOT do this. I'm going glass next time.