Woolrich Men's Ten Mile Hiking Sock 57% Acrylic, 19% Wool, 16% Nylon, 7% Polyester, 1% Lycra Spandex Made in US Machine Wash Seamless toe closure - no blisters Double welt top for stay-up comfort Arch and ankle support reduces fatigue Reinforced abrasion zones for long lasting wear Cushion for impact absorption