A total of 1 review of this product on Reddit.
14th Dec 2018
go to your local fabric store and find actual black out fabric, the kind of shit used for film screen and shit. cut out a square of cardboard big enough for your windows and get a cut of the fabric a little larger than the cardboard (so it can wrap back on it. then just push it all into your window so its nice and snug. you wont get any light coming through and it’ll help a bit to keep your room cool (assuming its warm with the sun on it and all)
I’ve tried black out curtains and they tend to kinda suck. proper black out fabric works really well when used correctly.
that or just get a sleeping blindfold