Blackout curtain Crafted from 3 layers lined blackout polyester fabric which make them super heavy. Their bright colors are 90% opaque and dark colors are 95% opaque. Resulting from a sandwich technique, they bock up to 90% of sunlight, UV rays and street light. Thermal curtain Balance your room’s temperature. Their 3-layers make them a great energy barrier against extreme heat and cold. Keep out cold in winter and block out the heat in summer, which make them ideal for any season.