Design and Details Performance Fit: No slipping, no bunching and no blisters Fine Gauge Knitting: Unprecedented durability and the unique "put it on, forget it's on" feel Fast Action Wicking: Pulls moisture away from skin 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: Ultimate fiber for breathability and comfort in all conditions True Seamless: Undetectable seam fusion for an ultra smooth, invisible feel Light: Built light, darn comfy and super strongGAfa AfA'substantial construction for a lightweight, sure fit Crew Sock Height: A classic, versatile height that hugs the calf 63% Merino Wool, 34% Nylon, 3% Lycra Spandex