The majority of the fabrics used to make the premium running socks featured on Sock Geek are synthetic, mostly petroleum based. With the interest in renewable resources growing, natural fibers such as wool and bamboo are becoming more common place. These natural fibers are great moisture managers, have natural anti-microbial properties, are very durable, and are soft on the feet. Also, many of these natural fibers biodegrade quickly in standard landfill environments. Get yourself a great sock and save the planet at the sametime!