https://www.nicetown.com/custom-soundproof-thermal-insulated-curtains-3-layers-soundproof-thermal-insulated-curtains-100-blackout-drape-made-to-order-by-nicetown-1-panel-p1581406.html

Is this one really blackout?

I would need to see how you are planning to install they will need to be much bigger than the window to make them trully blackout

@Alice S - I am not familiar with that brand, though the website is extremely annoying in its pop-ups and difficulty viewing on a phone. What I can tell you is that the choices they offer in how the panels are hung will make a difference in how light-blocking they are. A pinch-pleat will not let light in at the top the way the grommeted version will.