Hormann Rollmatic Insulated Roller Doors are constructed from triple layered slats, an exterior aluminium skin. a CFC-free polyurethane foam insulation core and an interior aluminium skin, to provide strength, durability and deep thermal insulation. They generally require less headroom than single skin roller doors. Very low maintenance and available in a wide range of colours and finishes. These are now the most popular type of electric roller door as the benefits of the insulated roll far outweigh the cost premium over single skin roller doors.