An office chair mat is a flat surface ... the underside to grip the carpet without damaging it. Mats for Medium to High Pile Carpets: Designed for carpets with a pile height over 1/4 inch.

The Gorilla Grip Office Chair Mat for Carpet Floor is also perfect for low to medium pile rugs up to ¾ inches high. Measuring 36x48 inches with a lip for under your desk, it provides ample ...