I love so much about this product. Not only does my kid feel safer in her bed at night with this but it cools off her bedroom in the summer as well. It does block out all the light that comes from that window. I put it up in like 15 mins so it's really easy to put together as well which is always a win-win. Also, a good feature about this product is that it comes with a "ring" to pull the curtain down with.