Ultra Silver socks utilize moisture wicking technology and nano silver technology to give you lifelong odor fighting performance. The Coolmax system keeps your foot dry by wicking excess moisture away from your foot, robbing odor causing bacteria of a place to establish itself and grow. X-Systems uses silver, a natural anti-microbial, to fight the growth of odor causing bacteria. This combination prevents the growth of odor causing bacteria, giving you extreme scent control for the life of the socks. Designed for durability and thermodynamics. Controls temperature and odor and allows your skin to breathe. Cushioned for CoolMax® and X-System select. 64% polyester, 28% nylon, 6% silver, and 2% spandex. Color: White. Made in USA. Features: Arch support to boost tired feet Flat linking toe closure to prevent bunching around the toes and blisters Lycra from top of the sock to the toe for superior fit Double welt tops Reinforced impact areas for greater durability and performance