Blackout roller blinds are a type of window treatment that is designed to completely block out light. These window treatments are often used in bedrooms or other spaces where people want to sleep or relax during the day.
Blackout roller shades are also installed in media rooms where they can be used to improve the viewing experience. These window coverings are very effective at 100% blocking out light, but their effectiveness can vary depending on the quality of the product and how well it is fixed to the window frame.
In short, blackout roller blinds are a good choice for people who want to block out light and create a night-like environment during the day in a room.