Darn Tough Men's No Show Hiking Socks - Light, versatile and always up for more. A dialed-in precise fit makes for a won't-quit sock when the challenges pile up. Performance Fit: No slipping, no bunching, and no blisters Fine Gauge Knitting: Unprecedented durability and our unique "put it on, forget it's on" feel Fast Action Wicking: Pulls moisture away from skin. Fast drying All Weather Performance: Cool in the summer, warm in the winter Naturally Antimicrobial: Repels bacteria and odor Guaranteed For Life: No strings. No conditions. For life Merino Wool: The ultimate fiber for breathability and comfort in all conditions True Seamless(TM): Undetectable seam fusion for an ultra smooth, invisible feel Light: Built light, darn comfy and super strong-substantial construction for a lightweight, sure fit No-Show Height: The toughest sock you'll never see. When your shoes are on this sock is gone 52% Merino Wool, 44% Nylon, 4% Lycra(R) Spandex Style: 1437