Medium Pile Carpet generally refers to carpets such as Berbers and or tight looped carpet and rug styles.
The thickness of the padding used under your carpet should help you to determine the best chair mat for your application.
As a general rule, a good choice for chair mat for a Berber carpet with a standard grade pad (carpet is fairly firm to walk on) would be our Ultra Supreme thickness.
Thicker heavier padding ( a more plush feeling) and or a heavier combination person/chair situation would require taking a closer look at the Executive Supreme or one of our Rigid style chair mats.