This is a 100% silk nightcap! It seems to use 6A grade silk. I bought it from a shop called COCOBEAU on Rakuten. It's sold as a set of two, pink and purple. Originally, it was 1980 yen each. I wore it about twice, but I haven't worn it since and have kept it in storage. I won't be using it anymore, so I'm selling it (^-^) ※The actual product photos are on the 8th image.