I've been trying to find blackout curtains that work for a wall of 4 windows facing south on our 2ed floor for 2 years. Each window 'lite' measures 32" x 53" H (not including trim at top, sides and below sill). So I ordered curtains 42" W x 63" L. I chose Pure White because dark colors made me feel like I'm working in a cave instead of my home office with photos, art and books I enjoy. I tried several brands of white 'blackout' curtains that were no more more effective than the linen curtains I made and used 20 years. This brand's white curtains DO work thanks to the black thermal lining. Out of the package they appear pure white; when hung there's a slight grey cast due to strong sun hitting the black liner. Based on reviews, I ordered 4 sets of the curtains. However, I find I only need 2 sets because a single panel blocks each window so well, and I don't have to get heavier duty rods to hold the weight of 2 panels. When I open the curtain next to my desk 4" or 5", the amount of sunlight is perfect to work without using my desk lamp or overhead light. I agree with other reviewers: just a few wrinkles out of the package, and after hanging a few hours, they're good without needing an iron. Best of all? Today for the first time I no longer need to run our central A/C below 74 in order to keep my office and adjacent bedroom comfortable. That's amazing, because as I type this the temperature where I live in N Virginia is currently 97F with a heat index of 111F, a record in a year of broken temperature records across the entire U.S.A. and around the world. Summing up, these curtains are kind to my wallet, the community where I live and the planet.