The WeatherTech Boot Liner fits in the lower centre boot carpet for very good carpet protection. Digital laser measurements of interior surfaces offer a consistently perfect fit! A patent pending High-Density Tri-Extruded (HDTE) material allows for a rigid core for strength while offering surface friction to the carpet, as well as tactile feel to the surface! Advanced surfacing creates channels that carry fluids and debris to a lower reservoir with further channelling to help minimize fluid movement while driving! Once fluids become trapped in the reservoir, the liner is easily removed and the mess goes with it!