Recognizing the need for a high-performance sock to compliment its tactical footwear line, Original S.W.A.T. has introduced a line of boot socks featuring X-Static Silver Systems technology. The over-the-calf styled socks are made from polyester-based Comfortrel with 5 percent X-Static Silver fiber. Comfortrel has the feel of natural fibers with the added bonus of breathability and moisture-wicking properties. The X-Static silver fibers eliminate odor-causing bacteria and athlete's foot fungus, eradicating 99.9 percent of bacteria in less than 1 hour of exposure. X-Static is safe and non-toxic, containing no chemicals or pesticides. It makes the socks cooler in the summer, warmer in the winter via reflective properties, low emissivity and thermal conductivity of silver. X-Static effectively conducts electricity, eliminating static shock and cling. The black-only socks are available in three sizes: medium (boot sizes 4 - 8), large (boot sizes 9 - 12), and X-large (boots sizes 13 -15).