100% Blackout: Blackout curtains are made of abrasion-resistant Oxford Cloth with a special silver coating on the back. They block and reflect sunlight and UV rays, reduce heat from solar radiation (though they do not block heat from airflow).
The light and thin material does not have to worry about falling off even if you stick a whole temporary blackout curtains to a large window. 【100% Blackout Waterproof Material】 blackout blinds can not only block 100% of sunlight and UV rays but also can be reused after washing.
Portable Blackout Curtains, 40" x 57" Blackout Shades, 100% Portable Blackout Blinds for Any Window with 15 Pair Hook & Loop Tabs Stick-on, Temporary Blackout Shades for Baby/Travelers/Bedroom. Portable Blackout Curtains！ Take You to Enjoy a Better Life !