Weird if you think about it, but nirvana for your feet. Advanced nanotechnology permanently melds the ancient beneficial properties of bamboo charcoal into the natural fibers of this sock. The result is a supple and incredibly comfortable 200 thread count knit that continues to get fluffier and softer with each washing. Every fiber is infused with charcoal to provide true odor eating and anti-microbial properties within a unique three-dimensional weave pattern that delivers exceptional moisture wicking ability. And (… “but wait, there’s more!”) as the socks are worn and heated by the body, good negative ions are also released, promoting increased foot health and improved circulation. Made from renewable organic materials, these luxurious socks are not only good for your feet and your health, but are good for the planet too. One wearing will make you a believer. S/M (6.5-9), M/L (9.5-13).