Both Thermal and 100% Blockout Curtains have a white acrylic coating on the reverse of the fabric. It is this coating that gives the curtain the "blockout" or "thermal" properties.
100% BLOCKOUT Curtains have three coatings on the reverse, commonly known as triple weave curtains. Two which are white and the middle coating is black. It is the middle black coating that makes the curtain room darkening, also known as SUNOUT because it turns day into night.
Both keep the sun out during summer and the warmth in during winter and are energy saving and environmentally friendly. This is one of our favorite energy saving tips for our customers. The 100% BLOCKOUT also darkens the room and provides some sound insulation. The thermal properties are better with the 100% blockout curtains.
You can shop for blockout and thermal curtains online here: