"Room Darkening technology blocks out some unwanted light while enhancing privacy Energy efficient design reduces energy lost through your windows by up to 25% Thermal properties help keep summer heat and winter chill out of your home Noise reduction up to 25% helps you get a sounder, more uninterrupted sleep and Built-in metal grommets fit curtain rods up to 1.5"" in diameter NOTE: Lichtenberg is the company name and Sun Zero is the brand name. The item can have both names on the packaging.Each panel sold separately.Note: These are room darkening curtains and amount of light blocked depends on how dark the base color is"