I purchased these because they matched the decor of my bedroom. They are described as blackout curtains but I would not say they are 100% black out. They more darken the room a bit than completely black out light. My main reason for purchasing these was that they are also marketed as temp regulators/energy efficient. On this I would give them a 3 1/2-4. I think they would work better once you have actually winterized your windows but on their own they only somewhat block out cold . The quality of these is quite nice. They are silky - be careful they are prone to snags! Also a note- is you are looking for pure white and grey these are more off-white and grey do to the black out backing. They are not pure white.

Pros: Nice Quality, Love the color
Cons: Snag easily