Double-skin sandwich panel cladding is a type of construction material that is used to cover the exterior of a building. It is made up of two skins, or layers, of material with a layer of insulation in between. The most common type of double-skin sandwich panel cladding is made with a metal outer layer and a foam inner layer. This type of cladding is often used on commercial and industrial buildings because it provides a high level of thermal insulation.