I'm not a silk kinda girl, because I always slide off sheets & pillowcase. I purchased the StayPut luxury silk pillowcase for my sister who is a 100% silk kinda girl. She told me the material is of the best quality she has had. It's not too thick nor is it too thin it's just perfect. I ask her about washing it, she said the washability is easy, she took it out of the beautiful box and hand washed it , I ask her why she hand washed it when she puts all of her others in the washing machine? That's when I found out those others are not 100% real silk. After she was done washing it, she air dried it then she put it on her favorite pillow and zipped it up making sure the zipper was closed. You would never know it had a zipper just by looking at it. When I told her how much I paid for it she immediately said , that's a great value. She will be ordering another one to go with it. When she woke up she couldn't believe how her hair looked, usually she looks like Phyllis Diller when she wakes up (yes her & I love together) her hair was still soft & she said it is the most comfortable pillowcase she has ever felt.