Not conventional but living in Texas it gets HOT...and its even hotter in South Texas than other places...I made curtains and put car window shades inside them - so the back is the same as the front but the silver shield you put up to keep the heat out of your car is sandwiched between. You can't see it and it really works! All but 1 of my window's have that.....so if they are looking to keep out light or heat - this worked for me!