Crafting a Green World brings us a great article on Soy fabrics. There’s a lot more information at the link, so go there to read the rest of it!
One of the coolest things about soy fiber is that it’s made using the byproducts from the creation of soy foods like tofu. That means soy isn’t grown just for fabric purposes, and that soy fabric production helps reduce waste.
The process for making the fabric sounds similar to bamboo: “Soy protein is liquefied and then extruded into long, continuous fibers that are then cut and processed like any other spinning fiber.”
This process is very chemical-heavy, but unlike a lot of rayon made from bamboo, it’s a closed-loop system, meaning they reuse the chemicals over and over rather than dumping them.
Crafting a Green World also did a great article on bamboo a while back (and they agree with me – bamboo is NOT the Eco-wonderful fabric that many want it to be).