Received not sure what was in package since so light and small! I had searched site looking for noise reduction curtains. There where many and I selected these. To my surprise when received there was no mention of noise reduction. Just room darkening. I have room darkening of a smaller size and this pair wasn't even half the weight. On inspection the backing was as my old which was to keep the sun light  from fading colors in room and cold air out. If that is what your looking for this is a good price. Not sure of fabric. Looks like a fine thread burlap. I wouldn't have paid the full price for them!