Get all-weather wool-blend comfort and performance in Darn ToughA(R) Hiker Quarter Cushion Socks. These hiking socks keep you cool in summer, warm in winter. That includes moisture-wicking, fast-drying, and naturally antimicrobial comfort. Even venting for added breathability. Performance fit, fine-gauge knitting means they won't slip or bunch. And True Seamless's undetectable seam adds to overall smooth wear. All-weather 61/37/2 merino wool/nylon/LYCRA spandex keeps you warm in winter, cool in summer Stay-put performance fit for blister-free wear True Seamless seam fusion for a smooth feel at the toes Moisture-wicking, fast-drying for comfort during high activity Fine gauge knitting for a "barely there" feel Naturally antimicrobial to repel bacteria and odor Side vents aid in breathability Mid-density underfoot cushioning 1/4 length is just above the ankle Lifetime guarantee Sizes Medium: fits Men's shoe sizes 8-9.5 Large: fits Men's shoe sizes 10-12 XL: fits Men's shoe sizes 12.5-14.5