The Swiftwick Flite XT Trail sock 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.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