There’s no way they’d be water proof. They’re nothing but small thin soft peices of material.
The smooth side is signifcantly cooler to the touch than a normal blanket or a sheet. As another reviewer said, i do shiny side up and i have it on top of my comforter and it does the job.
It hardly fits a queen. The blanket is slippery. It's not queen sized if it barely covers the top surface of a queen bed.
It seems very overpriced for what it is. The sale techniques used are truly a scam. All other benefits are outweighed.
The return policy is such that once you have slept with the item you can't return. Piling issue is so bad now that i cannnot use it anymore.
The nylon side is cool to the touch, but i think that is the only cooling feature. There is nothing about this blanket that is cooling. It also is not very breathable from my experience.