BDF EXS35 EXTERIOR Window Film High Heat Rejection Silver 35 (Medium) - 12in X 14ft EXCELLENT HEAT REJECTION. Helps reduce cooling costs especially during the summer through effective blocking of harmful solar rays. Also, minimizes fading on furnishings caused by the sun. FILM APPLIED ON THE OUTSIDE. It rejects heat by reflecting a lot of the solar energy out before it can even pass through the window. STRONG ADHESIVES to last many years. For easier installation, remember to use A LOT of soap/water mixture to soak both the adhesive side and window. HIGH QUALITY PERFORMANCE films that are sensitive by nature. Please remember to take caution when handling the film as the slightest fold will create a permanent wrinkle. FREE TOOLS AND EASY INSTALLATION GUIDE to make installation DIY-friendly. Make sure window surface is completely clean and absolutely free of any blemishes. The silver color will give the window a slightly reflective look. Although reflective, this window film is not intended for one-way mirror applications. Provides minimal privacy for rooms that require less view shielding. Window film is to be applied on the OUTSIDE as product name suggests. Perfect for rooms that desire a lot of sunlight exposure.