Was supposed to be for medium carpet. There are already dimples in the pad from the casters on the chair. I fully anticipate that I will be making a claim under the lifetime warranty. Definitely not DOF medium carpet
Although the mat feels stiff the five-caster chair still presses into the mat and make moving around difficult if you sit in one position for ten or more minutes.
This mat is not as durable as my old one. The chair leaves "dents" in the mat which makes rolling to a different position difficult. I would not recommend it.