Buy Chair Mat -

Mark the point flush with the carpet surface and measure that length. Requires a standard thin mat. Medium Pile (Up to "): Needs a thicker mat with slightly longer spikes. High Pile (Over

The backing of the mat is determined by the floor surface to ensure stability and protection.

Use mats with a smooth back . Spiked mats will damage hard floor finishes. The "Paperclip Test" for Carpet