It is recommended for carpet up to 12mm thick including underlay. It has friendly gripper back holds mat in place. Protects carpet from chairs with ease of movement. Durable, clear design lets carpet show through. It is ideal for many different applications from chairs to heavy traffic. 5 year warranty applies when used in the correct application. Available in various sizes: 90x120cm, 120x134cm, 120x150cm and 120x200cm.