They do not block out all light but there is ...
582187
They do not block out all light but there is a significant difference from regular curtains. They don't block noise or temperature though, that's just a marketing gimick
4428263
The color isn't exactly what I wanted & they don't keep out as much daylight as I hoped they would. They do make the room darker though, just not "blackout," & seem to be decent quality.
61464
I ordered these because I wanted navy blue room darkening blackout curtains for our bedroom, but eclipse does not make them with a valance to match.  I read reviews all over (not just on Amazon) that they block out light, but they do not block out all of the light.  Yes, they do darken the room a lot, but they don't completely block out the sunlight like the eclipse curtains do.  Nonetheless, the color is exactly how it is in the picture, however there is a design on it that I couldn't tell from the picture.  It's not a bad design and unless your looking at the curtains to see the design while they're hanging, you can't tell.  The curtains are also thinner than I thought that they'd be.  I decided after putting them up that I would buy the thermal light blocking liners for behind them, but if you're going to do this too, I suggest making sure you have enough space to put a small rod behind them as the curtains seem too thin to be able to attach heavy duty hooks through the material.  I'm simply just afraid the weight of the liners and the hooks will shred the curtains.  They are nice looking curtains. They're a great color and I'd still recommend them, but I just thought I'd put a more accurate review of them out in the open.
92705
The color is fantastic. They are not quite as "light-blocking" as I expected, but they do filter it so it's not as bright.
4354624
Not completely blacked out but it does filter out like 75% of the sunlight.
1386812
Not really a blackout. Allows a lot of sunlight.
2524737
Great light blocking windows.  They aren't as white as I thought the picture showed but fine.
1539951
They do a pretty darn good job... but they still allow a considerable amount of light through. So if your looking for sleeping blackout Id say no to these. Otherwise we love them.
4017920
.They are very bright but they do give off a slightly different color.
395726
They work. Light is a bit white for my tastes and it is very much a spot and doesn't cast out very wide at all.
4523567
does not block lots of light, the fabric could be finer.
65401
Not totally black out curtains. If you want total darkness, do not get these. They work well enough for our nursery, but a lot of light does come through.
3113774
Pretty curtains but they definitely are NOT blackout. I still like them though and they are a pretty color.
791207
Definitely a gray hint as described by other reviewers.  I gave the product only 4 stars since they do not completely block out light
4586380
We installed these to help our daughters sleep better and they work. They don't do a great job of keeping the heat or the elements out but if you want a good blackout curtain this will do the job. I would suggest getting them in a dark color in order to increase the amount of darkness in the room.
4838776
They do block out light for me, but I don't have full sun where they are placed. Blocking the light wasn't my concern, I wanted the thermal feature and a certain look. First, I don't believe the thermal claim is accurate.  So don't buy these to keep your The picture had that look. The black and white "look" in the picture seems to blend a bit differently and the curtain material has a richer look.  They hang well if you buy enough of them.  Don't be skimpy if you are buying for the look. I have 2 on the left, and will need 1more for the right side. You can see it's more of a creased look on the left.  They do block out light for me. I don'thave full sun where they are placed. But, blocking the light wasn't my concern, I wanted a certain look and the picture matched that look.
2761994
Nice for the price and really block the light. Not as easy to get the creases out as I would like but for the price I will work a little