The Sun Zero Cyrus Curtain Panels provide the ultimate in light blocking technology to keep out even the harshest of light. Sun Zero Total Blackout technology is laboratory tested to block out light and limit outside noise by up to 30%. Comfort is optimized with thermal insulation that helps keep summer heat and winter chill out of your home. Hang in your entertainment room to eliminate screen glare and mitigate distracting outside noise, or in your bedroom for enhanced privacy and a sounder, more uninterrupted sleep.