TechGearLab

The Imprint CumulusPRO Commercial Couture Strata is the only mat we tested to be certified by the National Floor Safety Institute, which makes the price tag a bit easier to swallow. The Imprint's damp cushioning isn't as soft as other mats, but its firm support made it one that our testers could stand on for long periods without fatigue. We found the Imprint exceptionally comfortable and were impressed with its stability on hardwood floors. The bottom of the mat clung to the floor surface well enough that we had to peel the mat up to move it. 
As you might imagine, the strong adhesion makes the Imprint harder to move than other mats we tested, most of which we could lift easily. Despite not being the most attractive mat, nor one that comes in a litany of colors and sizes, this is still our first recommendation for a solidly built, supportive, and stable flat mat.

Anti-Fatigue Desk Mat Comparison