DuraTherm Insulated Rear Door Liners help protect your crew van while suppressing noise and controlling temperature. The liners are made of dual polypropylene outer skins laminated to a central fluted plastic core. The outer skin in backed with a foam and foil insulation resulting a 0.4-inch thick liner with an R value of 4-6 (with insulation).The door liners protect the sheet metal or the glass in the window cavities from moving objects inside the van that could cause potential damage, such as dents or broken windows.The noise-deadening material and temperature control make for a quiet and comfortable environment. The lightweight, precision-cut and pre-drilled material, with included mounting hardware, provides quick and easy mounting of the liners.Why Use Crew Van Liners? Prevent DamageIn the daily use of your crew van, there are many objects that can cause damage inside (and outside) the vehicle. Loose cargo and using your van as a mobile work site can result in accidental damage to the interior walls/doors. A recent customer told Legend that he put two nasty dents into the side of his vehicle within the first week of owning his brand new van. These dents cause the paint to crack and flake off on the exterior of the vehicle and can eventually lead to rusting.Reduce Road NoiseCrew vans' thin outer steel panels are getting thinner by the year, and do very little in the way of reducing road noise. With the noise of the tires on the road, the creaking of the traveling vehicle, and sound of rocks or other debris flying up and hitting the vehicle, it can be quite irritating for the driver.Control TemperaturesThe temperature in a cargo van is often hard to keep stable. With only bare metal panels, it's nearly impossible to hold the temperature steady. This means it's too cold in the winter and too hot in the summer. This can lead to problems with your cargo such as freezing or melting.