Q. How much does your Insulated Liner weigh?

A. 88" long Ultimate Liner's weight with plastic bag, and packaging (carton inserts, instructions, carton stiffener, etc.) is 1 lb 12 oz. Shipping weight is bigger depending on the box weight. The Ultimate 88" long liner itself without extra packaging is 1 lb 9 oz. The weight of other sizes are a little more or less than this one, like 77" long Ultimate Liner weighs 1.2 lb. 

Q. I understand Ultimate Liners are stiff, so if I attach them to my curtains that means I can't open the curtains when I want daylight?
 
A. Ultimate Liners are sturdy, but not stiff, they flow as a thick fabric, so you can open the curtains, and they will be gathered on the rod along with the curtains without any problem. 

Q. I discovered your Ultimate Liners. My windows are bigger than your largest size - about 120 x 60 inches. In your honest opinion, will it be worth buying if the liners are smaller than the windows?
 
A. If you try to use Ultimate Liners as they are, they won't do much good in terms of thermal value. But what you can do, out of three 45" wide x 56" tall liners you or a seamstress can make 2 wider liners, about 59.5" wide x 56" tall by cutting one of the liners in half and attaching its half to the whole liner.

What is the difference between a thermal liner and thermal curtains? Do they have the same insulation value?

The liners are meant to be used along with regular curtains. Then this combination will have the same insulation value, as thermal curtains.

Do your insulated liners come in custom sizes?

No. They come in standard sizes.