Eye masks are now very common. As for their use, you can just put them on your eyes when you want to take a rest. The back of the eye mask can be tied to the back of your head to prevent it from falling off. Eye masks can generally be washed directly or brushed gently with a brush. I am currently using a music eye mask, which is very creative. It is very enjoyable to wear the eye mask while listening to music on a plane. It is also sold on Taobao now. You search for Shanglvbao flagship store in the mall. This should be directly operated by the manufacturer, which is more reliable. The price above is at least twice cheaper than in the physical store.