Light Blocking Strips – White 72" Permanent 2pc – Window Light Blocker for Window Roller & Cellular Shades – Side Light Blocker for Bedrooms, Nurseries & Media Rooms

These are fantastic. Don't let you husband install.

Absolute game changer. Working night shift means needing good blackout during the daytime, that annoying strip of light to the side of the roller shades always bothered me. After installing these the room is completely dark. It’s sleek enough and doesn’t take away from the room decor. Easy to install, just peel and stick. It can be trimmed to fit the length of your window but since the material is thick it’s a bit difficult to cut. Don’t expect to use a kitchen scissors, I ended up using a utility knife and even then it was a task but I guess if it were thinner then it would be too flimsy

GREATLY reduces light leaks around the edges of blackout shades. Let there be darkness! One star taken off for value for money. Seems a bit pricey for the materials involved, but otherwise, five stars. Also, not trivial to fit around the blind brackets, and requires modification (i.e. cutting up) for satisfactory results - but that's not the fault of this product. Ideally, you'd leave a SLIGHT (1/8") gap on both sides of your made-to-measure blackout shades when installing to allow room for these to go in with less fuss, but if we're talking "ideally," ideally the shade companies would license these and sell them to you as an option up front.

We purchased this in 2022 in a dazed state of new parenthood. It worked really well to close out the remaining light and helped our toddler sleep. Two years on, I was nervous about removing it before we check out of our rental apartment. I dug out my order and emailed Sleepy Time Tracks: they were very responsive and reassuring, so I went ahead and peeled it away. Pleased to report it came off easily and cleanly in one piece, with only a slight discoloration of the paint (which I haven't even tried to remove as our landlord is painting anyway). No residue or foam left. And this wasn't new paint either, but probably a decade old (typical white gloss paint of a window fitting). I'm impressed!

I expected the adhesion to be a lot stronger. I ended up having to use 3M command strips which is fine but the point of the adhesion back is so that shouldn’t be needed. The product itself is great, blocks light just as expected, so I’d still recommend it!

Bought black out pull down curtains that worked excellent… except for the edges. Took a risk getting these but once installed they work perfect and they look like they’re meant to be there.

I returned and only received the shipping cost as a refund. Didn’t work in the room I needed. Was not worth the hassle.

These are great. I ordered custom blackout blinds and, silly me, I decided I didn't need to order the light blocking edges that were offered with the blinds. Soon realized that a lot of light still came through the edges, but the brand I ordered from did not offer the edges separately--they only let you purchase them at the same time as the blinds. I found these and they looked like they would do the job. They work really well! I easily cut off a couple inches of each strip with tin snips and had no issues with anything breaking. I noticed my window was not perfectly straight, but these flex a bit to fit against the wood. I kind of messed up and got one stuck in the wrong place while applying but was able to quickly pull it off (with no damage to the wood) and put it in place. They all seem to be holding well. I imagine you could get some new tape if you really needed to move them. I might do that, because I didn't plan and put these permanent light blockers right in front of my windows' locks and now I can't unlock the windows. Oops. I should have gotten the removable version to put on those sides of the windows. I'll swap them out at some point.