It's like high quality construction paper with adhesive to adhere wherever

The tape is pretty strong as well and it comes with clips to hold the shade up as well or roll it up when you want

They are easy to cut and may need some additional adhesive but that is a very simple fix! Great product! These are great!! I live in a studio apartment lined with Windows! These have saved me during night shift rotations!! 🙌🏼🙌🏼😍😍😍They are super easy to install as well!The pic shown has the blackout shade behind the curtains on the right! Huge difference!! The best thing I have purchased in years! My bedroom is as dark as can be and I sleep like a hibernating bear now

The adhesive that comes with the shade is really a one and done deal

Completely blocks out light from the two windows in baby's room

I frequently travel to some very bright areas on this planet and often find myself working nights