What type of chair mat should I use with an office chair?

Chair mat specification at OfficeFurniture2go.com uses commercial-grade polycarbonate (not vinyl) mats rated for 300+ lb users. Vinyl mats crack and curl under sustained commercial use; polycarbonate holds its shape indefinitely under proper loads. For commercial carpet (Berber, loop, or high-traffic commercial pile), we specify 3/16 inch polycarbonate mats with 5/16 inch grip studs. Tempered glass mats are specified for premium executive offices. We include floor type in our chair accessory specification. Call 1-800-460-0858.