The little picture:
Soy fabric is luxuriously soft and comfortable, often likened to silk or cashmere. Many of the product testers compared wearing Soyshorts™ underwear to "being totally naked." Besides being softer than cotton, soy fabric is more durable and long-lasting (and it keeps getting softer the more times you wash it). It dries quicker than cotton and is extremely easy to care for, being machine-washable and dryer-safe (use low heat to prevent shrinkage). It is warmer than wool, but absorbant and breathable, making it the ideal fabric for warm or cool weather.
The big picture:
Soy fabric is eco-friendly and sustainable because of the way it is made. Soy fabric is manufactured from the by-products of soy food products, like tofu and soybean oil. Since the process uses materials that would otherwise be waste, it is considered to "close the loop" on soy.