This is because the 30-meter silk fabric is thicker and denser. Ruffle is a unit used to measure the weight of silk fabrics, indicating the weight of each fabric. The higher the value, the heavier the fabric. Generally speaking, 30 mm silk fabric is thick, has good shielding performance and is not easy to transmit light.

In addition, the fibers of real silk fabrics have natural luster and silky texture, which also increases their shielding performance. The special structure of silk fiber enables it to reflect light rather than penetrate it. Therefore, even a thin 30 m silk fabric can provide a certain shielding effect and is not easy to transmit light.