This is a vinyl curtain designed to block cold air. In the photos, it's shown being used in winter, installed on a window to block cold air from outside. However, in my home, I used it to divide a large living room in half, improving the efficiency of the air conditioner and saving on electricity bills. It was very helpful, and there was a noticeable difference in temperature between the air-conditioned side and the other side of the curtain. However, I've changed the layout of my living room and no longer have a use for it, so I'm offering it to someone who can make use of it. I have another of the same item listed, so you can connect four panels together (one of the four is unused). Please note that due to shipping costs, the price will not change even if you purchase them at the same time, and they will be shipped separately. For those looking to save a little money during the hot summer months...