One thing to consider is if your walkway is painted or not. When we had our driveway and walkway to the front door painted, it was suggested that we NOT get mats with a rubber backing.....they can stick to the paint in the heat and pull it up when you pick up or move the mat. A sisall type mat is what we used for a few years. Now I'm using a mat I bought from the Stanley Steemer company years ago. The backing isn't totally rubberized, just a bit, here and there....and it seems to be working fine.
If your mat gets moldy, flip it over, let the sun work on the underside for a bit....should help clear the mold.
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