Water-Horse mats come with a containment border holding up to 1-gallon of water per square foot. With a high profile rubber edge to aid water retention, Water Horse mat is designed to remove dirt, grit, and moisture from footwear and guarantees skid resistance. Ideal for busy entrances; indoor and outdoor placement. Special mat with high water retention capacity. Extremely durable polypropylene surface. Embossed waffle design. Skid-resistant nitrile rubber back. High profile rubber edge to aid in water retention. PVC-free. Suitable for underfloor heating.