Earth ion bamboo charcoal socks THE HEALTHIEST HAPPIEST SOCKS IN THE WORLD! On my quest to find more ways to bring healthy negative (-) ions into our lives, I discovered that charcoal from bamboo was a fantastic source. Years later I discovered bamboo charcoal can be made into actual FABRIC! My first thought was having negative (-) ion socks! A bonus is that Bamboo charcoal is also known for helping reduce odors! Happy feet year round! Made from HEALTHY ion Bamboo charcoal fiber. VibesUP helps bring more of nature's wisdom and balance back into our modern lives. Sizing for this sock is a UNISEX ONE SIZE FITS most. WASHING INSTRUCTIONS: Wash inside out on gentle cycle or hand wash. Air dry.