The boot socks are anti-microbial, and contain a fiber that is coated in silver to combat bacteria growth that causes odor and stains.
The extreme cold weather mountaineering socks are intended for wear in sub-zero temperatures on rugged terrain.
The socks are natural-colored, seamless with a terry or tuft stitch to the inside of the entire sock and a top finished with a nonraveling welt, overedge stitching, or a rib stitch.
Purchase description CR/PD 03-18 covers the requirements for boot socks that incorporate antimicrobial properties.