3M™ Ultra Safety and Security Window films are made up of 42 layers of micro-thin polyester films and are extremely durable. When subjected to pressure or extreme temperatures, the film merely stretches and does not break. In rigorous GSA and ISO blast testing, 3M™ Ultra Safety and Security Window films have proven to seriously mitigate the damage from bomb blasts by reducing flying glass, which can help save lives. It can provide absolute protection from temperature changes and other potential adversities. In many instances, it keeps out wind and rain, and can help keep flying glass from harming inhabitants.