3M Sun Control Plus All Season Window Films, or Low E films, function similar to sun control films except that they offer an increased performance against cold weather heat loss. The patented construction of these films enables the metal coatings to reflect more of the interior room heat back into the room where it is needed. This improves comfort by reducing potential drafts near the window, and may also save on fuel costs, especially in commercial buildings. The LE films are also protected with our unique abrasion resistant coating to ensure long-term durability and maintained appearance.