These thermal liners were easy to wash (I didn't notice a strong smell) and do the job of blocking the cold from the window. But if you have tab curtains rather than grommets, you have a bit more work. You are supposed to put ties through the loops at the top of the liners and then tie them through your curtain tabs. The ties sent with the liners were too flimsy to work through small the loops and too short; we ended up using white string.   

Pros: Does the job of thermal protection.
Cons: Flimsy, short ties sent with order. You'll need string or something else.