Polyester 100% BLACKOUT & UV REJECTION: Special blackout liner is attached on the inside of the cellular material, making our window shades block 100% light and harmful UV rays. NOISE REDUCTION & INSULATION: The special honeycomb structure design offers noise-absorbing and insulation, keep warm in the winter and cool in the summer. CORDLESS & PRIVACY CONTROL: Cellular shades are a safe, cordless choice for families with children or pets. And they can block unwanted views from outside, offering full privacy when the shade is lowered. EASY TO PULL DOWN & UP: These window blinds are very easy to pull the shade down and up, you can control them at any position you want. INSIDE & OUTSIDE MOUNT: Cellular shades can be installed inside or outside the window frame.