Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Is it made of 100% silk?
Document: This is one of the best purchases I've made in a long time. If you believe satin helps your face when you sleep,Then you'll totally believe that this is the holy grail! Small size is the best!
Great concept to wake up wrinkle free. Needs a pillow case that needs to be made of non slippery material like cotton so that the pillow stays in place the whole night. Otherwise, the pillow could end up anywhere else by the time you wake up.
First, I got such a great service - I had a time limit which I failed to see when I placed the order. Linda made a special effort and send my order on Saturday instead of Monday, and the package arrived within 2 days, it was so helpful and so kind, as she did not request extra for the service.
In retrospect, I'm surprised how comfy this pillow is. This could have been annoying but it slips right under my head and neck, my face doesnt really touch the pillow except at the temple, and I'm supported perfectly. It stays in place quite well, the satin makes it cool. I've been using it about a week. It seems well made. I can bend it to be a neck support easily and it bounces right back.
I used to wake up with lines on my face from my face being scrunched against my pillow. Mind you, I'm only in my late 20s, but I've never been able to train myself to not sleep on my stomach or side. This pillow has not only made it much safer for my face (I wake up with my skin completely smooth, despite still sleeping on my side), but it also made it much more comfortable to sleep. It even makes sleeping on my back more comfortable.
I have to put this pillow on top of another soft pillow to get the necessary support for my neck. I sleep on my sides and since I started using it, I've noticed my face looks fresher in the morning. My complaints on this pillow are the size, which I consider is too small, and the material which also needs to be upgraded; I put it into another satin pillow case to preserve it because I dont trust the material it was made with...
The pillow was flat like in other reviews. I bought this to see how well it work, and it works fine. Eventually I will purchase the more expensive pillows. I don't wake up with wrinkles or lines. If you toss and turn this is not the pillow for you. It needs to be placed on top of another flat pillow. And since its silk it can slip. I rarely have that happen, but it has happened a time or two.
i love it, It is great, comfortable and really works protecting lash extensions.really easy to take with you while traveling.It should come with a  pillowcase...
cute pillow ..Does the trick but its a little TOO SMALL.
While the original thought was "it's so much smaller than I'd expected", this pillow turned out to surpass expectations. I love it! It's just the right size, provides very comfortable support, and encourages restful sleep.
Answer: It isn't made of silk at all. The label says "all new material consisting of polyester."