DuraTherm consists of dual polypropylene outer skins, vacuum heat sealed to a central honeycomb plastic core, resulting in a 5/16" thick panel. A foam/foil insulation is then added to the back of the panels to get the perfect interior liner product. All pre-cut, pre-drilled sections are extremely lightweight. This lowers fuel costs as opposed to other systems which are heavier and weigh the vehicle down. This also creates a quick and easy install.