ANDERSEN WaterHog® Masterpiece™ Select Mats are specially designed for indoor entrances with heavy traffic. Polypropylene construction. 1/4" thick. Unique grid pattern scrapes dirt and water off feet from all directions. Made from 25% recycled rubber and 24% recycled polypropylene. Pile is molded-on reinforced crush-resistant rubber ribs, while the entire mat is backed with slip-resistant Tri-Grip™ cleating. Water dam on all sides traps up to 1-1/2 gallons per square yard—prevents moisture from spreading. NFSI certified to be slip resistant. Made in USA.