Experience the darkness, silence and bliss of the Eclipse Blackout Thermaliner Curtain Panels. The magic is in the thermal construction. Eclipse blackout liners have been laboratory-tested to block out over 99 percent of outside light and reduce unwanted noise for a better night's sleep. Pair this energy-saving liner with your existing curtains and immediately start saving on home heating and cooling costs. Eclipse thermal curtain liners give you the instant versatility to add more function to your window treatments.