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 Cushion: Mid-level cushion density under foot. A warm and ultra-comfortable choice when conditions demand it Micro Crew Height: A shorter, more concise take on the traditional crew height. Peeks just above the top of a standard hiking boot 63% Merino Wool, 33% Nylon, 4% Lycra® SpandexVendor Style Number: 2005