From the boardroom to the backcountry The Standard Mid-Calf is a dapper gent that\'s always on top of the details but Darn Tough to the core.. Features. 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™: Undetectable seam fusion for an ultra smooth, invisible feel.. Specifications. Light: Built light, darn comfy and super strong—substantial construction for a lightweight, sure fit.. Mid-Calf Height: A go-to, working height that’s always ready to take on more.. 55% Merino Wool, 42% Nylon, 3% Lycra® Spandex