[ Excellent Material ] Our blackout roller shades are made of 100% waterproof polyester with a thermal insulated coating that performs well in terms of temperature and light control. Excellent Shading Effect can protect your privacy and also provide a good sleep at night. [ Aluminum Cover ] The top of pull down shade is covered by an aluminum that prevents internal damage and keeps the roller shade clean. This metal cover not only provides ease of installation, but is also more aesthetically pleasing and a great addition to your home. [ Safety and Clean ] Our roller shades are equipped with chain connectors for the safety of children and pets. And our blackout shade is waterproof and oil-proof. You can clean it easily with a damp cloth or a feather duster. Save your energy and time. [ Inside Mounting ] Measure the height, width and depth of the window. The depth is at least 2.5 inch. For inside mount, blind width need to be at least 1/4 inch less than window width (wall to wall). [ Outside Mounting ] Lower requirements than inside mount. Roller blinds width need to be 3-6 inch wider than window width, to avoid gaps. You just need to make sure the blackout fabric can cover the whole window. [ Product Dimension ] for example if you chose 20" x 72"; For mounting the brackets and operating mechanism, the actual fabric width is 1’’ less than blind width, so the fabric width is 19 inch. Product Description4 Reasons Choose LUCKUP Window Blind Shades Waterproof Fabric Made of 100% polyester fabric, waterproof, no special care required, just clean it with wet cloth or a feather duster. Safety Design Special protection for children. Equip with a chain connector. When your child or pet is entangled in the chain, it will be disconnected by a certain pulling force to prevent the child from being injured. 100% blackout Shading Effect The thermal insulated blackout window shades can effectively protect your privacy. Thick and sturdy texture fabric perform nicely in noise-reducing and is conducive to sleep. Aluminum Cover The top of the blind shade is made of aluminum. It wraps the blinds and prevents the interior from damage. It also provides convenience for installation. How to choose the size of the window blinds Measure the size of your window Please measure the size of your window before you place an order. Attention：Blind Width = Fabric Width + 1’’The actual width of the fabric will be approximately 1'' less than the overall blind width ordered, this is to allow for the brackets and operating mechanism. Inside Mount Window Depth > 2.5 ''Order Width = Blind Width = Window Width - 0.25’’E.g. If window size is 36.25’’ × 65’’ , then order size is 36’’ ×72’’ Outside Mount Order Width = Blind Width = Window Width + 3-6’’E.g. If window size is 36.25’’ × 65’’ , then order size is 39’’ ×72’’ How to Install LUCKUP 100% Blackout Waterproof Roller Shades Window Blinds