EconoMat Carpet Chair Mat, Rectangular, 36 x 48, BlackThinner, lightweight EconoMat delivers a great value to anyone looking for an occasional use office chair mat to protect low pile and commercial carpets up to 0. 25" thick. Easy glide rolling surface provides smooth office chair movement to help minimize stress and strain on users back, legs and feet. Studded design grips carpet and keeps the chair mat from moving while protecting floors from caster wear, spills and heavy traffic. Free and Clear non