CRO GS23 CHA -- 2x3 Charcoal Rely-On™ Olefin Indoor Wiper Mats Economical continuous filament olefin on standard vinyl is ideal for light to medium applications. Plush surface dries moisture from shoes.holds up to 1 gallon of water per square yard. Heather patterning complements any decor. Contributes to LEED Certification. Backing: Vinyl with natural organic resin blend. Manufacturerfs limited one-year warranty. Overall thickness 3/8-inch. Sold by the Each.