Our thermal screens block out light and keep you cool/warm, they trap warm air and reflect the heat or cold They totally block out the light, which means you can get a few hours extra sleep in the mornings Total black out The screens have 5 layers: 2 layers of foil, 1 layers of plush warm to touch fleece and 2 layer of bubble wrap Large 50mm soft suckers so they don't fall off in the night UV protection