The description + pictures make it look like they are insulated / lined, but they're not. The material has a canvas feel more than soft cloth, and though they are hemmed they only have one layer of fabric to them. They felt cheap, and sadly, arrived with a few dirt spots on them. Two stars because I think for smaller, more insulated windows they might do the trick. For real curtains that keep in the warmth, these aren't it. (Amazingly, I found the perfect curtains --soft silky cotton and lined w/ thermal fabric--for half the price at TJMaxx!) Be warm ya'll!