DuraMat Chairmat is designed and properly weighted for firm, low-pile carpets up to 3/8" thick with little or no padding. Textured surface delivers scuff-resistance and slip-resistance. Beveled edge allows smooth, on-and-off chair movement. Studded-back chairmat is made from the highest quality materials resulting in maximum transparency. Free and Clear formula produces an exceptionally clear mat that is nonphthalate, noncadmium, BPA-free and lead-free.