I got this about a week ago, an I can tell the difference already in my kitchen. It cuts out 90 % of the light, an keep the heat in. The reason I really wanted a black out curtain was to keep our air or heat inside and keep the light out. It is well designed and very well sewed and put together. One panel was enough to cover my whole window, which is amazing in it self. It is beautifully designed and matched my decor perfectly.  Absolutley one of the best curtains I have owned.