Clear, rectangular chair mat helps extend the life of your carpet by distributing the pressure from chair casters. Designed for carpets up to 3/8" thick (including padding), the studded backing provides a secure grip without piercing or damaging carpet backing. Smooth edge allows easy chair movement. The clear, heavy-duty material protects against daily wear while allowing the beauty of your carpeting show through. Lip measures 20" x 10".Clear, rectangular chair mat helps extend the life of your carpet by distributing the pressure from chair casters. Designed for carpets up to 3/8" thick (including padding), the studded backing provides a secure grip without piercing or damaging carpet backing. Smooth edge allows easy chair movement. The clear, heavy-duty material protects against daily wear while allowing the beauty of your carpeting show through. Lip measures 20" x 10".