Block out light perfectly IF they fit snugly. Accidentally ordered mine an inch wider than the window but was able to cut it on a table saw for a closer fit. The adhesive strip on top sticks well to a clean, smooth surface. Magnetic strips keep the curtain on the window sill. The problem arises when the curtains are closed. The underside of the umbrella is flexible. Constant use can leave a hole in the material that could be grabbed to close. It would be nice if there were little plastic handles to close the curtain.
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