I first read about this product from Cosme Ranking book as one of the most popular beauty tools.
I purchase this for about $6 at the San Francisco Muji Store.
You can also buy the wider version from Muji online store HERE.
In Muji Stores, there are 2 colors to select from (light grey and light brown). I personally like the brown color more.
It is a very-soft-towel texture. The back of the turband has only one long elastic band which keeps the hairs in place without the tight feeling.
I hand wash with soap in cold water. Since this turband is very thin, it takes a very short time to air dry.
Check it out when you visit Muji.