If you want complete shield from the sun and cold to add to your current curtains that are already blackout curtains you will have more protection then. You can use the hooks provided or you can sew the liner on the back of your curtains you have (if possible depends what kind you have) to insure that sun and cold is blocked out. You will love Eclipse curtains! Make sure you buy the eclipse blackout curtains then add this as an addition if you are wanting to use this as I said for extra protection otherwise just use your standard curtains with this behind it. 

Pros: Just great
Cons: No cons