The Flite XT Trail is the most technologically advanced sock ever engineered for hiking and trail runs, offering a blend of natural Merino wool with Olefin fiber for moisture-wicking, temperature regulation, and stability on any terrain. Now in Quarter Crew for medium coverage. AnkleLock™ Technology Moisture Wicking Merino blend Made in USA Moisture Wicking Lifetime Performance Guarantee Fabric tech AnkleLock™ Technology GripDry™ Fiber CUSHIONING Medium For versatile comfort COMPRESSION Moderate For flexible support best for Hiking Trail Running Running Natural Merino WoolMoves moisture away from feet keeping them dry and blister-free even during the longest of treks. AnkleLock™ TechnologyUses strong elastic to wrap your ankle and heel, providing targeted support to protect you during quick movements. Arch Band SupportMaintains shape, keeps sock in place and gently supports arch. Details Natural Merino wool and Olefin footbed keep your feet dry and blister-free, whatever the conditions AnkleLock(TM) Technology featuring targeted ankle and heel support provides protection during quick movement Proprietary GripDry(TM) fiber in the heel and forefoot grips shoes to keep feet stable Material & Care 38% Nylon / 24% Merino wool / 22% Olefin / 13% Polyester / 3% Spandex Machine wash cold. Tumble dry low. Do not bleach or iron Our Guarantee Swiftwick socks are made to endure through thick and thin. The Lifetime Performance Guarantee is our commitment both to our products and to our customers, ensuring our socks stand the test of time.If your Swiftwicks wear out for any reason, we’ll replace them. Simple as that.