I would suggest these curtains anyone that’s not looking for complete blackout. There are moderately decent in construction and fabrication. As far as level III black out I would strongly debate these as meeting that level of expectation. There is a second layer of fabric sewn to the back but open at top and bottom of these curtains for prevention of light flow. I highly doubt these will do much good in the coldest of months at keeping the heat in versus the cold out and vice versa and the hottest months of the year. Just something to consider. Coloring seems washed out and overall Pattern and fabric just seem dull a