Details 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. Specs Fabric: 49% Nylon / 46% Merino Wool / 5% Lycra® Spandex Light Cushion: Light and strong with a thin layer of cushioning along base of foot. Our most versatile construction. Crew Sock Height: A classic, versatile height that hugs the calf. A sock drawer staple.