"Extreme Blackout technology with magnetic closure blocks out 100% of outside light Energy Efficient design reduces energy lost through your windows by up to 50% Thermal properties help keep summer heat and winter chill out of your home Noise reduction by up to 45% helps you get a sounder, more uninterrupted sleep Hidden back tabs fit curtain rods up to 1.5"" in diameter.Pair includes two (2) panels. Measure carefully prior to purchase."