Staples Low Pile Chair Mat, 36" x 48"This Staples Low Pile Chair Mat protects the unpadded commercial carpet in your office from the wear and tear caused by hard plastic casters. Place the mat under an office chair for a strong, smooth surface that makes rolling your chair easy and safe. The chair mat is made of durable plastic that resists cracks and discolouration. This mat is also waterproof, which helps keep your office carpet safe from spills.