When you ask about sheerness I’m not sure what you mean? They not heavy but they are thick enough and dense enough to keep out the light. They also repel the heat, and we are in a serious heat wave right now. The same is true about keeping a lot of the cold out and we have double pane windows. I worked nights for a good part of 20 years and these black outs made that possible so as too sleep during the day. Thanks so much
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