I got these to replace a "room darkening" set of curtains, that didn't darken the room (my bedroom) at all.  After carefully reading all the reviews for the Sun Zero curtains, I took a chance and ordered them.  They do block out all the light, as advertised!  So, very happy with them.  They have a nice soft look and feel to them, also.  Highly recommended if you don't want light shining into a room.