Product Details + Features Instep compression Secure heel pocket Arch support Flat knit construction Seamless toe closure Can be worn as a liner Technology: OrbitKNIT® ribbed cuff for an inclusive, secure fit without constriction Yarns: Merino wool polypropylene reinforced with nylon exterior Content 38% MERINO WOOL - 35% NYLON -25% POLYPROPYLENE - 2% LYCRA