"Blackout technology blocks out most unwanted light while enhancing privacy Energy efficient design reduces energy lost through your windows by up to 40% Thermal properties help keep summer heat and winter chill out of your home Noise Reduces outside noise by up to 30%. They will help you get a sounder, better, more uninterrupted sleep..Built-in metal grommets fit curtain rods up to 1.5"" in diameter.Panels sold individually. Measure carefully prior to purchase..Performance varies by product color; darker the base color the more light blocked 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."