Place ANDERSEN WaterHog Waffle Design Mats inside entrances with heavy traffic. Great where water, snow, and ice are a problem because the dam on all sides stops water from spreading. Polypropylene surface with rubber backing. Made from 20% post-consumer recycled rubber and 24% post-consumer recycled polypropylene. Non-slip surface features grid-patterned pile molded onto rubber nubs to prevent crushing. Non-skid, rubber backing is not affected by temperature extremes. Can be used on most carpet surfaces and on all hard surfaces. During snowfall, ice melt may be used on mat surface. NFSI certified to be slip resistant.