They are primarily use as security shutters. In addition they offer various benefits. Firstly, they create a thermal insulation. In winter they allow for lowering the costs of heating while in summer they reduce the amount of heat flow into the house. Secondly, they form an acoustic insulation, reducing the noise flow. Finally, they allow for keeping the light completely out of a room.
The roller shutter can be made of aluminium or steal filled with polyurethane. The former is used for windows and doors; the latter- for production of garage gates.