They are great for making heavier weight curtains. I made mine for the South side of the house during the winter it keeps the cold out even though we have good windows and during the summer keeps the heat out.Wish I could find another bargain of polyester to make more curtains these are probably 20 years old now and they only thing wrong is the backside is fading finally.I still need to make curtains for a couple more rooms in the house and then I will be done .I also made a quilt out of it and it is super warm now.Absolutely LOVE it!!!!!!