Feet sweat. During athletic performance your socks get damp. The moisture in your sock actually increases the amount of blister-causing friction and provides a perfect home for odor and infection causing bacteria. SmartKnit Active socks are made with COOLMAX high-tech moisture wicking fibers. These fibers actually wick-away moisture from the feet, ensuring a dry sock. The antimicrobial action also kills odor and infection-causing bacteria.