There is a whole book of different window films out there and the possibilities can seem endless and overwhelming, but here at Asgard we’ve simplified our window film products into 4 main categories; Neutral, Reflective, Dual Climate and Specialty. Each category has its own range of shades, varying by units of Visible Light Transmission (VLT), this number is next to the window film name. Remember this rule while considering which film to have installed: The lower the number (VLT), the darker it is.