Bests & Worsts Reviews from Amazon

They are curtains. They do block out 100% of the light coming from the window. Light will still shine out around them depending on how close they are mounted to the wall. Measure you opening well and add a little bit for the pleating of the fabric as it weaves onto the curtain rod. I got the 52”X84” and that is the size of the fabric itself. You lose 1.5” from the top of the curtain to the ring and when fully stretch on the rod it only measures 44” wide. IE 8” of fabric is lost as the curtain weaves back and forth on the rod.