Review (5/5): Excellent
I tried it on once and knew right away I needed to buy a back up. It is a loose fit so you might need to use an eye mask over it to keep it in place.....or not it really depends how rough you sleep.
Otherwise cotton outside and satin liner inside.
My hat size is 7 1/2 60cm.It fits great but not super form fitting or taught. I would say if your head is smaller than that expect to need something to hold it in place....like a sleep mask.