Over-foil 311+ is a certified, eco-sustainable reflective insulation made of pure aluminium. Composed of 7 layers in total, it has 2 outer layers of pure aluminium protected and reinforced with mesh; the 5 internal layers are additional reflective films, layers of wadding and expanded PE film. Tested in accordance with the new UNI EN 22097 standard, it is thin but offers good insulation performance