Don't allow swivel chairs to damage your carpet--simply use this PVC chair mat. This clear vinyl mat has a centered 20" wide lip on the width dimension. Features a uniform textured pattern on top surface and a uniform, nonskid coating on bottom. The molded cleats on the underside help prevent the mat from moving. Smooth rounded corners for style and safety. The overall dimension includes the lip. The .15" thickness is designed to be used on medium- to high-pile carpets. Backed by manufacturer's lifetime warranty against cracks and breaks.