Lipped chairmat features an innovative, linear design for enhanced comfort and workspace ergonomics. Its smooth-rolling surface makes it easier to roll with less stress on your joints and back. No-crack construction protects your flooring surfaces to help prevent costly repairs or replacement. Rigid base is engineered with linear ridges and micro cleats to eliminate shifting while in use. Chairmat is designed for use with medium-pile carpets up to 3/4" thick including padding.