Review (5/5): Updated review.
"The cap is pretty and soft but I bought a shower cap, not a sleeping cap. It is not waterproof at all."
UPDATE: I tried the product and wrote my review (see above). I slept in the cap and didn't think anything else of it. Their customer service reached out to me very kindly, determined to make things right. They offered me a replacement or a refund for the defective item and were prompt, polite and professional in their replies. I was honestly surprised that they emailed me at all since I didn't bother to contact them about the defective item-- again, I was just going to use it as a sleeping cap. The fact that they took it upon themselves to reach out and try satisfy their customer proves that they care about the quality of their items and their reputation for having a good business.