WeatherTech 2025 Kia K4 Cargo Liner with Bumper Protector - BlackWeatherTech Cargo Liners provide complete trunk cargo area protection. Our cargo liners are computer designed to fit your vehicle and have a raised lip to keep spills, dirt and grease off your vehicles interior, protecting your carpeting from normal wear and tear. Made from a proprietary custom blended TPO (thermopolyolefin) that is not only wear resistant, but also remains flexible under temperature extremes. The WeatherTech Cargo Liner features a