Studded design secures mat from moving while protecting carpet from caster wear, spills and heavy trafficEasy-glide rolling surface provides effortless chair movement.Studded bottom surface provides superior, non-skidding gripping power over carpet. Extended lip provides protection while your chair is rolled under your deskSmooth beveled edge enables easy carpet to chair mat transition at home, office or any commercial environment.Free and Clear non-phthalate, non-cadmium formula promotes a healthy work environment while offering exceptional clarity and durability.