Total Blackout technology blocks out 100% of outside light while enhancing privacy. Built-in magnets keep curtains securely closed to prevent light from leaking through. 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 reduction by up to 40% helps you get a sounder, more uninterrupted sleep. Set includes two (2) curtain panels, measure carefully prior to purchase.