It is a heat-reflective insulation in rolls with absolutely exclusive performance that cannot be compared with that of other types of insulation, which depend directly on thickness to exert their insulating function. In addition to the pure aluminum reflective surfaces, its peculiarity is that it has a 3-mm-thick foamed polyethylene sheet inside and is heat-sealed in the middle and at the ends of the roll along its entire length. This special feature allows two additional insulating air gaps to be created within the product itself during installation.