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. Free and Clear formula produces an exceptionally clear mat that is nonphthalate, noncadmium, BPA-free and lead-free..