I needed small blackout curtains to cover the front door windows of my Honda Elements that was converted into a micro home on wheels. I was skeptical about them at first, but they turned out to be a very affordable and very effective solution. They protect well from the sun on a sunny day. I would definitely say that at least 90% or more of the light is blocked. Some might not like the texture, which I would best describe as leathery, but I'm not picky. In addition, this is stated directly in the title of the article. Yes, I would have preferred a smooth, non-textured material, but it works well for my needs.
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