In the first time, the curtains just have single function. That is thermal function. Till now with the development of the curtains, a curtain always have all blackout function, soundproof function, insulated function, thermal function and so on. This is all because of the development of science and technology. But with the progress with the science and technology, the material of making curtains become more and more. Except the natural material, there are also manmade material. All of this material are related on our healthy. The experts mention us, in different seasons we better use different material of curtains. It is good for our healthy. Now we use the sheer curtains as our example. Then I will explain the functions of sheer curtains for you next.