soy fabrics are derived from the hulls of soybeans—a manufacturing byproduct. soy fabrics can be blended (i.e. 30%) or made entirely out of soy fibers. soy clothing is largely biodegradable, so it has a minimal impact on environment and landfills. although not as durable as cotton or hemp fabrics, soy clothing has a soft, elastic feel. soy clothing is known as the vegetable cashmere for its light and silky sensation. soy fabrics are moisture absorbent, anti-bacterial, and uv resistant. however, soy fabrics fell out of public knowledge during world war ii, when rayon, nylon, and cotton sales rose sharply.