Raised nubs remove dirt and moisture from shoes and trap it below foot level; water dam border holds up to 1.5 gallons of water per square yard, keeping your floors clean, dry, and safe. Eco-Friendly PET fabric is made from at least 97% recycled content reclaimed from plastic, and SBR rubber backing contains 20% recycled rubber from car tires. Beveled edges provide a safe transition from floor to mat; certified high-traction by the National Floor Safety Institute (NFSI). Durable reinforced nubs prevent pile from crushing and extend the performance life of the mat. Fade and stain resistant solution-dyed PET fabric (30 ounces per square yard) is resistant to staining, dries quickly, and will not fade or rot.