Review (5/5): Quality Shower Cap
The inside and outside are lined with Vinyl. It can be a little warm wearing it but it's perfect for keeping the water out. If you have a conditioning treatment, you can put it on and then wash out the inside given the material that is going on in there. You get two per container, which is great. That way you can always just be washing the old one if you need to. I prefer cloth ones for sleeping. But this could def work if you have some sort of leave in overnight conditioner situation.