Get a better night's sleep, anywhere you go. Sun Zero Lights Out Portable Blackout curtains provide the ultimate in light blocking technology to keep out even the harshest of light while adding privacy. Sun Zero Total Blackout technology is laboratory tested to block out 100% of light and reduce outside noise by up to 35%. Comfort is optimized with thermal properties that help minimize summer heat and winter chill. While made with travel in mind, Lights Out curtains are perfect for baby's rooms, entertainment rooms, apartments, or anywhere that installing curtain rods isn't practical. Pre-attached suction cups to allow for easy installation on any window surface. When not in use, store your curtain in the included drawstring travel tote for dust-free portability.