CHAIR MAT protects your carpet and flooring from surface friction from your desk chair wheels. The transparent chair mat allows flooring colors to show through the mat. 1/4" THICK CARPET PILE is the ideal pile for this chair mat. The gripper-back surface of the mat works best with 1/4" thick carpet pile. This chair mat for carpets measures 36" x 48" and is 2.2 mm thick.