Swiftwick Flite XT Zero Socks With managed compression, the Swiftwick Flite XT Zero socks are the top of the line in workout socks right now. These performance-focused socks were designed to provide stability and moderate compression during high-impact workouts. They feature mid-level cushioning that provides long-lasting comfort without ever getting in your way or feeling too bulky. Special, GripDry™ Fiber is blended with moisture-wicking Olefin that has microtreads to help prevent your foot from slipping while moving inside your footwear. AnkleLock™ Technology actually wraps around the ankle to provide lateral support during cutting movements.Made in USA.ZERO, below the ankle design.Made with 200 Needle construction. Features Flex Channels that help improve range of motion and provide moisture control around the forefoot. Sizing Small: Men's 3-5½ / Women's 5-7½Medium: Men's 6-9½ / Women's 8-10Large: Men's 10-13 / Women's 10½-14Extra Large: Men's 13½-16 / Women's 14½-16½U.S. shoe size equivalent.