Over-foil 2L-2 is a reflective insulation foil in rolls consisting of two polyethylene air bubbles covered on both sides with a sheet of protected pure aluminium. Ideal for use in construction thanks to its compactness and ease of processing, it is also used in many industrial applications. When inserted inside an air cavity, it reflects most of the radiant energy that strikes it without absorbing it, increasing the insulating power of the cavity itself by more than 4 times.