DuraMat Checkered Chairmat is recommended for low-pile commercial grade carpets up to 3/8" thick with little or no padding. Checkered grid design on back grips carpet to hold mat in place. Chairmat features a textured top surface. Beveled edge allows smooth on-and-off chair movement. Nonstudded design won't pierce or damage carpet backing. Chairmat is made from the highest quality materials resulting in maximum transparency.