Both our standard and double-sided Omnigrid® cutting mats are designed for use on both sides.
Standard Omnigrid® mats have a front side that is printed with a grid and measurements; the back side of standard mats is unprinted. Some people see better on the blank (gray) side than on the printed (green) side. If you are having problems with blurry vision when cutting, try cutting on the back side and see if that helps.
Omnigrid® double-sided mats are printed on both sides; one side has an inch-marked grid, and the other side is a centimeter-marked grid.