Exclusive water dam design allows Waterhog Classic to trap dirt and water (up to 1.5 gallons per square yard) so they stay in the mat and off of your floor--minimizing slip hazards and floor damage around the perimeter of the mat. Unique ridged construction effectively removes and traps dirt and moisture beneath shoe level. Exclusive rubber reinforced face nubs prevent pile from crushing, maintaining high performance and extending product life. Premium 24 ounce heavy duty polypropylene fiber system allows fabric to dry quickly and prevents fading and rotting. Mats can easily be vacuumed or hosed off. Waterhog Fashions highly durable, attractive fabric border makes it the perfect choice for indoor or outdoor applications. Anti-static rating averaging 1.2KV with a maximum average voltage of 1.6KV as measured by the AATCC. Gripper backing design holds to carpet but also works well on flat surfaces.