?HEAT INSULATION,ENERGY SAVING and BASIC PARAMETERS - One way window film blocks out 90% of infrared rays and 85% of UV rays reducing fading and aging of interior furnishings. The heat control window film can retain heat in winter and keep it out in summer, reducing expensive heating and cooling costs. 15% of VLT helps effectively reduce glare. ?THICKNESS AND HIGH QUALITY - Glass film the thickness of 6 mil window film has excellent thermal insulation effect, with anti-scratch layer on the surface, friction resisting, won?t fade nor blister, easy to remove, economical and practical. ?PRIVACY PROTECTION ? Attention about window film privacy, there's different privacy effect between daytime and night. The one-way window film provides great privacy during daytime only and outside glass shows mirror effect. As the outside light becomes weaker, the mirror effect of outside glass will disappear gradually and outside people can see inside . When the inside light is stronger than outside, the mirror effect will be reversed. Remember to draw curtain during night. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.