I downloaded the Nike Making App last year. I get it.
I found this article on the App, written back in 2013.
How are recycled bottles turned into fabric?
This video is a little more detailed than the Nike one.
The Making App.
I jumped into the footwear section and learned about:
My Ramie lesson took me back to youtube for a look at the traditional methods of weaving Mosi ( fine ramie).