Here is a great article by Ron Morris regarding your choices for natural and sustainable fabrics for running. Anyone can go onto Amazon and load up on polyester and plastic running gear but if you are becoming a conscious individual than I would urge you to try out running gear made from natural and sustainable fabrics. The next generation of runners will thank you for being so thoughtful.
http://www.runningplanet.com/sustainable-and-eco-friendly-running-gear.html