Amazing curtains! I got them for my father since he has not been able to sleep past 6am since he moved into his new place that happens to face somewhat East.  They blocked out the sun so good he slept in the next day! When I hung them, I also noticed they even block out sound fairly well, too. Seems made with quality fabric and Not flimsy like others, these seams were firm. Material is thick letting threw 0% light.