Sateen Patio Charcoal Solid Woven Room Darkening Grommet Top Curtain, 100 in. W X 84 in. LSateen Patio room darkening blackout grommet top patio curtain panel brings a rich, luxurious look and ultra soft feel to any room. This panel is interwoven with room darkening blackout insulation provided by Light Block and Thermax technology. Designed to block light and preventing harmful UV rays from reaching your floors and furniture, these panels also prevent cold or heat transfer from the outside, increasing the energy efficiency of your home.