No other mat material works so well Don Aslett's AstroTurf Mats can't be beat. Each blade of synthetic "grass" works like a tiny scraper to clean every boot, shoe and paw that passes. So where does the dirt go? It falls to the bottom of the mat. That's important because it prevents the next person from tracking it in. They're simple to clean too. Just pick them up, carry them to the trash or corner of the garden, and dump the dirt. You'll be amazed at how much dirt they collect! Up to 80% of the dirt that makes it to the doorway will be stopped in its tracks. Place one at every entrance to your home, including the garage. Not recommended for wood decks exposed to significant sunlight. Our commercial quality mats can last up to 15 years.