Heat protection with suction cups for window darkening. The window sun protection shields living, sleeping, and working rooms from direct sunlight in the summer, making it an ideal glare protection. At the same time, it prevents excessive heating of the room due to the blackout effect. Thanks to multiple suction cups, the universal blackout can be flexibly attached to skylights as well as in cars, trains, or motorhomes. Dirty blackout blinds can be washed in the washing machine at 30 degrees.