I only use the front of my mat, with the measurement lines, when I really need it. Otherwise I use the back, measuring my WOF cuts using the measurements on the ruler. It really "saves" the front. Also when I cut fuzzy fabrics or batting I use the back. If the little "wispies: cling to the cut mark, it doesn't matter. Once a week I use a lint roller to remove all the "wispies"