I love these curtains!! I brought the Fresh popcorn color which is basically a true off white with no yellow tents at all. They completely block out any draft and all light due to their thick layers. I closed 4 panels completely and opened my window to test the amount of air that would make it’s way into the room and the curtains smothered the medium air flow entirely. These are heavy, weighing around 7lb per panel so you would need to support the weight. 
These curtains look and feel like I paid top dollar. 
I highly recommend!!