Review (3/5): I'm glad it's actually much larger than I expected so there ...
It's definitely not "satin" inside, not even polyester, but for the cheap price and the fact that it actually stays on my head throughout the night without leaving an imprint in my forehead, it's worth keeping. The outside of the cap is actually softer than the inside so I have to use it inside-out. I'm glad it's actually much larger than I expected so there will be room for my to grow!