The CargoTech system integrates with either the WeatherTech Cargo Liner, standard carpeted surface of your car trunk or SUV cargo area to aid in securing large or unusually shaped items, such as grocery bags or plants. Molded from two different materials, the WeatherTech CargoTech system couples a durable plastic "fence" with a super grippy underside to ensure your goods remain stable. Sold as a set of four.