Swiftwick Pursuit Hike Four Ultra Light Socks The Swiftwick Pursuit™ Hike Four socks are made to support you on your next hiking adventure. A versatile blend of Merino Wool and Olefin provides the feel and performance needed throughout the cold Winter months and during the hot, Summer months, too. This sock features a four height, sitting below the calf for extra protection around the ankles. Proud supporter of the American Hiking Society. Seamless toe eliminates friction and irritation. Features dual high-performance fibers to maximize durability. Features an minimal cushioning for wearing with lightweight boots and trail shoes. Made in USA. Sizing Small: Men's 3-5 / Women's 5-7Medium: Men's 6-9 / Women's 8-10Large: Men's 10-13 / Women's 10-14Extra Large: Men's 13-16 / Women's 14-16 U.S. shoe size equivalent.