Hlc.me Dakota 100% Complete Blackout Lined Drapery with Double Layer Thermal Insulated Energy Efficient Window Curtain Grommet Panels for Bedroom & Li

2 Layers provide the utmost blockage of anything you are trying to keep out. Single-Layer curtains can only block some light, heat or cold, which will still allow to enter through the sides of your curtains. With these curtains, you can save double the amount of money on your energy bills.