These door liners professionally designed for cargo van door insulation are made from the same durable plastic (DuraTherm) as the wall liner and add extra protection, premium insulation, and sound deadening in the vehicle 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.Available in white and grey in colour, Legend has these door liners available for most cargo vans on the market. Cargo van door insulation is one of the best investments you can put into your vehicle.