The Crystalline Series features a proprietary, multilayer optical film nano-technology that combines over 200 layers in a film that is thinner than a Post-it® Note. Improving comfort, protecting vehicle interiors and blocking UV rays are hallmarks of 3M™ Automotive Window Films. 3M was issued the first sun control window film patent in 1966, and our innovative window film products have helped provide protection from the sun’s harmful rays for 50 years. NOTE: Auto tint laws vary by state or province. Please check your local laws or ask your dealer installer for films that meet your local tint laws.