Peckish...she didn't say bamboo. She said "soy".
I had to Google it...here's the blurb for it on Fabric.com:
Soy Soft is made of soybean protein fibers. It has the lustre of silk and the feel of cashmere. The fibers are stronger than wool, cotton or silk. Naturally antibacterial and made with eco-friendly materials. Cleaned without harsh chemicals. Our needle-punch technology enables us to avoid the use of binders or resins. Will not shift or shed. Stitch up to 8" apart. 50% Soy fiber - 50% cotton.
Sounds interesting.