Polyester Block out unwanted light with a bright, fun pop of color in a kids bedroom, playroom, or any room of your home Energy efficient design reduces energy lost through your windows by up to 40% Thermal properties help keep summer heat and winter chill out of the room Noise reduction up to 30% for a sounder, more uninterrupted sleep Silver metal grommets allow for easy hanging on a curtain rod up to 1.5"