Does the job!  This pad seems to do what it should which is keep a rung from slipping and sliding.  The size is just 2x3 so I would say good enough for a large door mat.  You can also easily trim it with scissors to fit.   It is exactly what I am using it for.  I have an interior rug going  out of my back door to the yard but it moves all the time so put this rug pad down and boom!   Perfect fix!!!