deflecto CM15113 RollaMat Frequent Use Chair Mat for Medium Pile Carpet 36 x 48 w/Lip Clear Protective vinyl chairmat offers resilient protection to prevent wear and tear and extend carpet life. Medium weight chairmat for frequent plus use on carpets up to 1/2" thick, Medium/High Pile. Choose a higher pile chairmat if usage is over 6 hours. Easy-glide rolling surface provides effortless chair movement.